Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046012053500
J. Ulmet, P. Auban, A. Khmou, S. Askénazy, A. Moradpour
The transverse magnetoresistance of (TMTSF) 2 PF 6 has been investigated in magnetic field up to 32 T, at low temperatures down to 4.2 K. Shubnikov-de Haas oscillations are directly observed on the magnetoresitance in fields higher than 18 T, but there is no evidence of a threshold field since the disappearance of oscillations can be explained by the normal field-dependent damping. However these oscillations vanish very quickly between 5 and 4.2 K. This unusual behaviour could be related to a phase-transition. Finally an exploration of the fundamental field versus θ is given (θ=angle between B and c * ), showing the warping of the «Fermi tubes» along the c * axis Etude experimentale de la magnetoresistance transverse dans des champs magnetiques allant jusqu'a 32 T, a basse temperature jusqu'a 4,2 K. Observation directe d'oscillations de Shubnikov-de Haas pour des champs superieurs a 18 T, sans qu'il soit certain qu'il existe un champ seuil, la disparition des oscillations pouvant s'expliquer par l'amortissement normal fonction du champ magnetique. Disparition rapide des oscillations entre 5 et 4,2 K, peut-etre due a une transition de phase. Exploration du champ fondamental en fonction de θ (angle entre B et axe c): gondolement des «tubes de Fermi» le long de c *
研究了(TMTSF) 2pf6在32 T磁场和4.2 K低温下的横向磁阻。在大于18t的磁场中，可以直接观察到磁电阻的舒布尼科夫-德哈斯振荡，但由于振荡的消失可以用正常的场相关阻尼来解释，因此没有证据表明存在阈值场。然而，这些振荡在5到4.2 K之间很快消失。这种不寻常的行为可能与相变有关。最后给出了基本场对θ (θ= B和c *之间的夹角)的探索，显示了“费米管”沿c *轴的翘曲。在实验中，de la magnetoresistance横向dans des champs magnetiques在32 T时，基底温度为4.2 K。观测到Shubnikov-de Haas在18t上的振荡，没有一定的振荡存在于champ seuil上，振荡的微分在champ magnetique上的微分在champ magnetique上的法向函数。由于一个相位的转变，差速振荡在5 ~ 4、2 K之间。探索基本函数de θ(角中心B和轴c): gondolement des«tubes de Fermi»le long de c *
{"title":"High-field magnetoresistance and quantum effects in the organic compound (TMTSF)2PF6","authors":"J. Ulmet, P. Auban, A. Khmou, S. Askénazy, A. Moradpour","doi":"10.1051/JPHYSLET:019850046012053500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046012053500","url":null,"abstract":"The transverse magnetoresistance of (TMTSF) 2 PF 6 has been investigated in magnetic field up to 32 T, at low temperatures down to 4.2 K. Shubnikov-de Haas oscillations are directly observed on the magnetoresitance in fields higher than 18 T, but there is no evidence of a threshold field since the disappearance of oscillations can be explained by the normal field-dependent damping. However these oscillations vanish very quickly between 5 and 4.2 K. This unusual behaviour could be related to a phase-transition. Finally an exploration of the fundamental field versus θ is given (θ=angle between B and c * ), showing the warping of the «Fermi tubes» along the c * axis Etude experimentale de la magnetoresistance transverse dans des champs magnetiques allant jusqu'a 32 T, a basse temperature jusqu'a 4,2 K. Observation directe d'oscillations de Shubnikov-de Haas pour des champs superieurs a 18 T, sans qu'il soit certain qu'il existe un champ seuil, la disparition des oscillations pouvant s'expliquer par l'amortissement normal fonction du champ magnetique. Disparition rapide des oscillations entre 5 et 4,2 K, peut-etre due a une transition de phase. Exploration du champ fondamental en fonction de θ (angle entre B et axe c): gondolement des «tubes de Fermi» le long de c *","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"52 1","pages":"535-542"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83964740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046011046300
C. Dominicis, H. Orland, F. Lainée
A spin glass phase is characterized by a large number of quasi degenerate states (or walley bottoms). Their free energies F a =F o +f a , where f a is a non extensive fluctuation, have recently been shown to be random independent variables, as in Derrida's model. Relaxation to equilibrium of such systems is considered and a simple approximation to the transition probability (in the master equation) is considered that leads to a (random) relaxation time τ∼expβΔF with −β(F o +ΔF)= In a Σexp(−βF a ). The ensuing relaxation to equilibrium is shown to be a stretched exponential a behaviour common to a wide class of materials. The dependence of the result on the particular choice of the transition probability is touched upon Etude des verres de spin, caracterises par un grand nombre d'etats (ou fonds de vallees) quasi degeneres, d'energies libres F a =F o +f a (ou fa est une fluctuation non extensive) se comportant en variables aleatoires independantes comme dans le modele de Derrida. Analyse de la relaxation vers l'equilibre a l'aide d'une approximation simple pour la probabilite de transition (dans l'equation maitresse) qui conduit a un temps de relaxation aleatoire τ∼exp βΔF[F o +ΔF)=log a Σexp(−βF a )
自旋玻璃相具有大量的准简并态(或瓦利底)。它们的自由能F =F o + F a，其中F a是一个非广泛的波动，最近被证明是随机的独立变量，就像德里达的模型一样。考虑了这类系统的平衡松弛，并考虑了转移概率(在主方程中)的简单近似，该近似导致(随机)松弛时间τ ~ expβΔF，其中−β(F o +ΔF)= in a Σexp(−βF a)。随后的松弛达到平衡被证明是一种被拉伸的指数行为，这是一种广泛的材料所共有的行为。结果对特定选择跃迁概率的依赖性涉及到Etude des verres de spin，特征parun grand nombre d'etats (ou fonds de vallees)准简并，d'energies libres F a =F o + F a (ou faest unextensive涨落)，重要的两个变量是独立的，独立的comme dans le modele de Derrida。分析l'平衡和l'aide ' d'une近似的de la弛豫概率跃迁(dans l'equation maitresse) -管道和untemps de弛豫微分τ ~ exp βΔF[F o +ΔF)=log a Σexp(- βF a)
{"title":"Stretched exponential relaxation in systems with random free energies","authors":"C. Dominicis, H. Orland, F. Lainée","doi":"10.1051/JPHYSLET:019850046011046300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046011046300","url":null,"abstract":"A spin glass phase is characterized by a large number of quasi degenerate states (or walley bottoms). Their free energies F a =F o +f a , where f a is a non extensive fluctuation, have recently been shown to be random independent variables, as in Derrida's model. Relaxation to equilibrium of such systems is considered and a simple approximation to the transition probability (in the master equation) is considered that leads to a (random) relaxation time τ∼expβΔF with −β(F o +ΔF)= In a Σexp(−βF a ). The ensuing relaxation to equilibrium is shown to be a stretched exponential a behaviour common to a wide class of materials. The dependence of the result on the particular choice of the transition probability is touched upon Etude des verres de spin, caracterises par un grand nombre d'etats (ou fonds de vallees) quasi degeneres, d'energies libres F a =F o +f a (ou fa est une fluctuation non extensive) se comportant en variables aleatoires independantes comme dans le modele de Derrida. Analyse de la relaxation vers l'equilibre a l'aide d'une approximation simple pour la probabilite de transition (dans l'equation maitresse) qui conduit a un temps de relaxation aleatoire τ∼exp βΔF[F o +ΔF)=log a Σexp(−βF a )","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"2000 1","pages":"463-466"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86225534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046011049900
A. M. F. Neto, Y. Galerne, A. Levelut, L. Liebert
Synchrtron X-ray measurements are performed in both uniaxial (discotic and calamitic) and biaxial nematic lyomesophases of the mixture K-laurate, 1-decanol and D 2 O. A first-order band and a second-order band with spacing ratio 1:2 characteristic of a pseudo-lamellar structure are observed in the three nematic phases. The X-ray diffraction results are interpreted in terms of the orientational fluctuations of intrinsically biaxial correlation volumes. It is argued that the calamitic and discotic phases are not built up of cylindric-like and disk-like micelles, but of aggrgates of statistically biaxial shape, similar in the three nematic phases. The only change at the uniaxial-biaxial nematic transitions is the long-range order Mesures realisees sur un melange de laurate de potassium, decanol-1 et D 2 O. Dans les trois phases discotiques, calomitiques et biaxes, on observe le premier et le second ordre d'une bande de diffraction caracteristique d'une structure pseudo-lamellaire. Les phases calomitiques et discotiques sont composees d'agregats de forme statistiquement biaxe, seul l'ordre a longue distance change aux transitions uniaxes-biaxes
同步x射线测量了k -月桂酸盐、1-癸醇和d2 o混合物的单轴(盘状和碟状)和双轴向列相，在三个向列相中观察到一阶带和二阶带，其间距比为1:2，具有伪层状结构的特征。x射线衍射结果用本质双轴相关体积的方向波动来解释。认为灾状相和盘状相不是由圆柱状和盘状胶束构成的，而是由统计上双轴形状的聚集体构成的，与三个向列相相似。在单轴-双轴向列跃迁中，唯一的变化是在月牙酸钾、十醇-1和d22的混合中实现的长程阶测量，在观察到一级和二级D 'une衍射带特征和D 'une结构伪层状结构时，实现了三相、焦相和双轴的衍射。低相位的calomitiques et distiques形成统计双轴，低相位的composees d' agreats形成统计双轴，长距离的变化形成单轴-双轴的过渡
{"title":"Pseudo-lamellar ordering in uniaxial and biaxial lyotropic nematics : a synchrotron X-ray diffraction experiment","authors":"A. M. F. Neto, Y. Galerne, A. Levelut, L. Liebert","doi":"10.1051/JPHYSLET:019850046011049900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046011049900","url":null,"abstract":"Synchrtron X-ray measurements are performed in both uniaxial (discotic and calamitic) and biaxial nematic lyomesophases of the mixture K-laurate, 1-decanol and D 2 O. A first-order band and a second-order band with spacing ratio 1:2 characteristic of a pseudo-lamellar structure are observed in the three nematic phases. The X-ray diffraction results are interpreted in terms of the orientational fluctuations of intrinsically biaxial correlation volumes. It is argued that the calamitic and discotic phases are not built up of cylindric-like and disk-like micelles, but of aggrgates of statistically biaxial shape, similar in the three nematic phases. The only change at the uniaxial-biaxial nematic transitions is the long-range order Mesures realisees sur un melange de laurate de potassium, decanol-1 et D 2 O. Dans les trois phases discotiques, calomitiques et biaxes, on observe le premier et le second ordre d'une bande de diffraction caracteristique d'une structure pseudo-lamellaire. Les phases calomitiques et discotiques sont composees d'agregats de forme statistiquement biaxe, seul l'ordre a longue distance change aux transitions uniaxes-biaxes","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"74 1","pages":"499-505"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79858094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046012054900
S. Alexander, O. Entin-Wohlman, R. Orbach
The relaxation rate of a localized electronic state interacting with localized vibrational states (fractons, localized phonons) is calculated for the one-vibrational quantum case. Care is taken to deal with the statistics of finding the localized vibration of appropriate energy position which can relax a given electronic state. The one quantum relaxation rate probability distribution is calculated. The time dependence of the relaxation profile is slower than exponential, but faster than any power law Calcul du taux de relaxation d'un etat electronique localise interagissant avec des etats vibrationnels localises (fractons, phonons localises) pour le cas a un quantum de vibration. Etude detaillee de la statistique des etats vibrationnels, d'energie et position appropriees, qui peuvent participer a la relaxation d'un etat electronique donne. Calcul de la distribution de probabilite du taux de relaxation a un quantum. Obtention d'une variation temporelle du profil de relaxation plus lente qu'une decroissance exponentielle, mais plus rapide que toute decroissance en loi de puissance
计算了单振动量子情况下局域电子态与局域振动态(分数子、局域声子)相互作用的弛豫速率。注意处理寻找能使给定电子态松弛的适当能量位置的局部振动的统计。计算了单量子弛豫速率的概率分布。弛豫谱的时间依赖性比指数慢，但比任何幂律都快。计算电子局域化的弛豫谱，相互作用的局域化的弛豫谱，粒子局域化的弛豫谱(分数子、声子局域化)和非量子局域化的弛豫谱。研究了详细的统计方法和振动方法，能量和位置的适当性，相当有效的参与者和松弛方法和电子方法。计算一个量子的弛豫概率分布。注意d' one variation temporelle du profilderelaxation + lente qu'une decrosion exponentielle, mais + rapide que tout decrosion en loi de issance
{"title":"Relaxation rate distribution and decay profile : one fracton emission","authors":"S. Alexander, O. Entin-Wohlman, R. Orbach","doi":"10.1051/JPHYSLET:019850046012054900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046012054900","url":null,"abstract":"The relaxation rate of a localized electronic state interacting with localized vibrational states (fractons, localized phonons) is calculated for the one-vibrational quantum case. Care is taken to deal with the statistics of finding the localized vibration of appropriate energy position which can relax a given electronic state. The one quantum relaxation rate probability distribution is calculated. The time dependence of the relaxation profile is slower than exponential, but faster than any power law Calcul du taux de relaxation d'un etat electronique localise interagissant avec des etats vibrationnels localises (fractons, phonons localises) pour le cas a un quantum de vibration. Etude detaillee de la statistique des etats vibrationnels, d'energie et position appropriees, qui peuvent participer a la relaxation d'un etat electronique donne. Calcul de la distribution de probabilite du taux de relaxation a un quantum. Obtention d'une variation temporelle du profil de relaxation plus lente qu'une decroissance exponentielle, mais plus rapide que toute decroissance en loi de puissance","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"42 1","pages":"549-554"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74331876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046011051300
I. Bivas
{"title":"Pores and their number in bilayer lipid membranes","authors":"I. Bivas","doi":"10.1051/JPHYSLET:019850046011051300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046011051300","url":null,"abstract":"","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"74 1","pages":"513-521"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91156610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046011046700
J. Bacri, C. Leygnac, D. Salin
By means of an acoustic technique we record the saturation time and space dependence in a porous medium consisting of sandstone into which immiscible flows are driven. When a totally wetting fluid (here water) injection is performed (inhibition), in a prewet sample (i.e. a medium at irreducible water saturation), the capillary diffusion presents symptoms of hyperdiffusion, which means that the saturation profile extends more widely than in classical diffusion Nous suivons l'evolution dans le temps et l'espace des profils de saturation lors d'ecoulements non miscibles dans un gres poreux au moyen d'une technique acoustique. Au cours de l'injection d'un fluide totalement mouillant (eau-inhibtiion) dans un echantillon premouille (a saturation irreductible en eau), nous avons observe que la diffusion capillaire etait hyperdiffusive, c'est-a-dire que le profil de concentration s'etend plus loin que dans le cas de la diffusion classique
通过声学技术，我们记录了由砂岩组成的多孔介质的饱和时间和空间依赖关系，其中非混相流被驱动。当完全湿润的流体(这里是水)注入(抑制)时，在预湿样品(即处于不可还原水饱和度的介质)中，毛细管扩散表现出超扩散的症状，这意味着饱和剖面比经典扩散扩展得更广，这意味着饱和剖面的扩展范围更广，饱和剖面的扩展范围更广，饱和度剖面的扩展范围更广，饱和度剖面的扩展范围更广。Au cours de l'injection d'un fluid totalement mouillant (Au -抑止)和unechantillon premouille(一种饱和不可还原的气体)，nous avons观察que la diffusion capillaire(超扩散)，c'est-a-dire que le profilede concentration(扩展)和loin que dans le cas de la diffusion classique
{"title":"Evidence of capillary hyperdiffusion in two-phase fluid flows","authors":"J. Bacri, C. Leygnac, D. Salin","doi":"10.1051/JPHYSLET:019850046011046700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046011046700","url":null,"abstract":"By means of an acoustic technique we record the saturation time and space dependence in a porous medium consisting of sandstone into which immiscible flows are driven. When a totally wetting fluid (here water) injection is performed (inhibition), in a prewet sample (i.e. a medium at irreducible water saturation), the capillary diffusion presents symptoms of hyperdiffusion, which means that the saturation profile extends more widely than in classical diffusion Nous suivons l'evolution dans le temps et l'espace des profils de saturation lors d'ecoulements non miscibles dans un gres poreux au moyen d'une technique acoustique. Au cours de l'injection d'un fluide totalement mouillant (eau-inhibtiion) dans un echantillon premouille (a saturation irreductible en eau), nous avons observe que la diffusion capillaire etait hyperdiffusive, c'est-a-dire que le profil de concentration s'etend plus loin que dans le cas de la diffusion classique","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"144 1","pages":"467-473"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77521973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046012052300
J. Duarte
Lattice data on fixed cycle directed animals show a structure for the dominant singularity paralleling that found for undirected animals, with an exponent θ c =θ 0 −c for c-cycle animals. θ 0 , the value for trees is equal to the animal exponent in each dimension La statistique des animaux diriges sur un reseau, avec un nombre cyclomatique fixe, montre une structure de la singularite dominante parallele a celle que l'on rencontre pour les animaux non diriges avec un exposant θ c =θ 0 −c pour un animal de nombre cyclomatique c. θ 0 qui correspond a des animaux ou arbre, est egal en toute dimension a l'exposant des animaux non diriges
Lattice data on fixed循环好,动物表演了失物招领奇点paralleling that for undirected主导结构for the animals, with an exponent(θc = 0−θc for c - animals。θ(0 - trees, the value for is equal to the animal exponent in chacun维度统计这边一个网络上的动物,与一个固定数目cyclomatique呈主导singularite平行结构,对于非动物遇到了那种这边带一份θc = 0−θ为一只cyclomatique c数。θc . 0对应的动物或树,是伊戈尔在任何层面的非动物的参展商这边了
{"title":"The singularity structure of fixed cycle directed site animals","authors":"J. Duarte","doi":"10.1051/JPHYSLET:019850046012052300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046012052300","url":null,"abstract":"Lattice data on fixed cycle directed animals show a structure for the dominant singularity paralleling that found for undirected animals, with an exponent θ c =θ 0 −c for c-cycle animals. θ 0 , the value for trees is equal to the animal exponent in each dimension La statistique des animaux diriges sur un reseau, avec un nombre cyclomatique fixe, montre une structure de la singularite dominante parallele a celle que l'on rencontre pour les animaux non diriges avec un exposant θ c =θ 0 −c pour un animal de nombre cyclomatique c. θ 0 qui correspond a des animaux ou arbre, est egal en toute dimension a l'exposant des animaux non diriges","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"20 1","pages":"523-528"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85049417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046011050700
G. Salvetti, C. Roucau, R. Ayroles, H. Mutka, P. Molinié
The formation of defects in the structural modulation associated with charge density waves (CDW) has been studied by electron microscopy in 1T-TaS 2 and 1T-TaSe 2 . The irradiation with electrons creates lattice defects that pin the phase of the CDW. This pinning induces strain in the CDW and forms the CDW defects. The response of the commensurate CDW in 1T-TaSe 2 is more rigid with respect to the incommensurate 1T-TaS 2 CDW in which the CDW dislocations are much easierly formed Nous avons etudie, par microscopie electronique, la formation de defauts de la modulation structurale associee aux ondes de densite de charge (ODC) dans 1T-TaS 2 et 1T-TaSe 2 . L'irradiation aux electrons cree des defauts ponctuels qui piegent la phase de l'ODC. Ce piegeage augmente la contrainte dans l'ODC et des defauts de l'ODC apparaissent. Dans 1T-TaS 2 les ODC incommensurables sont plus souples que celles commensurables dans 1T-TaSe 2 et des dislocations de l'ODC se creent plus facilement
{"title":"Defected structural modulation in the charge density wave compounds 1T-TaS2 and 1T-TaSe2","authors":"G. Salvetti, C. Roucau, R. Ayroles, H. Mutka, P. Molinié","doi":"10.1051/JPHYSLET:019850046011050700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046011050700","url":null,"abstract":"The formation of defects in the structural modulation associated with charge density waves (CDW) has been studied by electron microscopy in 1T-TaS 2 and 1T-TaSe 2 . The irradiation with electrons creates lattice defects that pin the phase of the CDW. This pinning induces strain in the CDW and forms the CDW defects. The response of the commensurate CDW in 1T-TaSe 2 is more rigid with respect to the incommensurate 1T-TaS 2 CDW in which the CDW dislocations are much easierly formed Nous avons etudie, par microscopie electronique, la formation de defauts de la modulation structurale associee aux ondes de densite de charge (ODC) dans 1T-TaS 2 et 1T-TaSe 2 . L'irradiation aux electrons cree des defauts ponctuels qui piegent la phase de l'ODC. Ce piegeage augmente la contrainte dans l'ODC et des defauts de l'ODC apparaissent. Dans 1T-TaS 2 les ODC incommensurables sont plus souples que celles commensurables dans 1T-TaSe 2 et des dislocations de l'ODC se creent plus facilement","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"118 1","pages":"507-511"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77449429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046011048300
B. Berkovsky, V. Kalikmanov
A finite volume of a magnetic fluid resting on a solid base in an external homogeneous magnetic field is considered. An approach to the theory of topological instability is proposed and the instability criterion is derived. The shape hysteresis (first order phase transition) for fluids with high magnetic susceptibility is predicted On a etudie le comportement d'un volume limite de fluide magnetique reposant sur une base solide et place dans un champ magnetique exterieur homogene. On a obtenu un critere d'instabilite topologique. L'existence de l'hysteresis des formes (transition de phase du 1er ordre) a ete predite
{"title":"Topological instability of magnetic fluids","authors":"B. Berkovsky, V. Kalikmanov","doi":"10.1051/JPHYSLET:019850046011048300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046011048300","url":null,"abstract":"A finite volume of a magnetic fluid resting on a solid base in an external homogeneous magnetic field is considered. An approach to the theory of topological instability is proposed and the instability criterion is derived. The shape hysteresis (first order phase transition) for fluids with high magnetic susceptibility is predicted On a etudie le comportement d'un volume limite de fluide magnetique reposant sur une base solide et place dans un champ magnetique exterieur homogene. On a obtenu un critere d'instabilite topologique. L'existence de l'hysteresis des formes (transition de phase du 1er ordre) a ete predite","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"27 1","pages":"483-491"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81336724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-06-01DOI: 10.1051/JPHYSLET:019850046012054300
A. Halperin, P. Pincus, S. Alexander
Etude d'un ensemble dilue de chaines polymeriques confinees dans un film de solvant etale sur une surface solide
在固体表面的溶剂膜中包含的稀释聚合物链的研究
{"title":"Instability of polymer films","authors":"A. Halperin, P. Pincus, S. Alexander","doi":"10.1051/JPHYSLET:019850046012054300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046012054300","url":null,"abstract":"Etude d'un ensemble dilue de chaines polymeriques confinees dans un film de solvant etale sur une surface solide","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"114 1","pages":"543-547"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85068965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：