Pub Date : 1990-09-01DOI: 10.1051/JPHYS:0199000510180201100
Š. Pick
Two expressions for the electronic energy, the second one of which is not selfconsistent, are analyzed. It appears that the two formulas are equivalent up to the first order in selfconsistent corrections
{"title":"Comparison of two expressions to compute the electronic energy of a crystal","authors":"Š. Pick","doi":"10.1051/JPHYS:0199000510180201100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510180201100","url":null,"abstract":"Two expressions for the electronic energy, the second one of which is not selfconsistent, are analyzed. It appears that the two formulas are equivalent up to the first order in selfconsistent corrections","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"1 1","pages":"2011-2013"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89839413","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170193900
F. Mogeon, G. Dolino
A systematic study of the variations of the irreversible properties of the incommensurate phase of quartz has been performed by birefringence measurements in 9 samples (either synthetic or natural) of various compositions determined by chemical analysis and infrared spectroscopy. The shift of the α-β transition temperature for large impurity concentrations has been verified. The properties of the incommensurate phase are very sensitive to small changes of impurity contents: a global hysteresis going from 10 to 220 mK has been correlated to the OH infrared absorption. Time dependent pinning steps and memory effects have been observed showing the importance of mobile impurities. Finally a regime of discontinuous variation of physical properties appears for slow rate of temperature variations. Thes Une etude systematique des proprietes irreversibles de la phase incommensurable du quartz a ete faite par des mesures de birefringence sur 9 echantillons (synthetiques ou naturels) de differentes compositions, determinees par analyse chimique et spectroscopie infrarouge. Les decalages de la temperature de la transition α-β, produits par des concentrations importantes d'impuretes ont ete mesures. Les proprietes de la phase incommensurable sont tres sensibles a la presence de faibles taux d'impuretes: des hysteresis globales variant de 10 a 220 mK, ont ete mesurees et une correlation avec l'absorption infrarouge due aux liaisons OH a ete trouvee. Des effets dependant du temps tels que des marches d'accrochages et des effets memoires ont ete observes, montrant l'importance des defauts mobiles. Enfin, un regime de variations discontinues des proprietes physiques apparait pour les petites vitesses de variation de la temperature. Les resultats de ces experiences ont ete compares a diverses predictions theoriques, telles que celles de la theorie des Ondes de Densite des Defauts dues a la diffusion des impuretes mobiles
{"title":"Birefringence study of the irreversible behavior of the incommensurate phase of quartz: effects of chemical impurities","authors":"F. Mogeon, G. Dolino","doi":"10.1051/JPHYS:0199000510170193900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170193900","url":null,"abstract":"A systematic study of the variations of the irreversible properties of the incommensurate phase of quartz has been performed by birefringence measurements in 9 samples (either synthetic or natural) of various compositions determined by chemical analysis and infrared spectroscopy. The shift of the α-β transition temperature for large impurity concentrations has been verified. The properties of the incommensurate phase are very sensitive to small changes of impurity contents: a global hysteresis going from 10 to 220 mK has been correlated to the OH infrared absorption. Time dependent pinning steps and memory effects have been observed showing the importance of mobile impurities. Finally a regime of discontinuous variation of physical properties appears for slow rate of temperature variations. Thes Une etude systematique des proprietes irreversibles de la phase incommensurable du quartz a ete faite par des mesures de birefringence sur 9 echantillons (synthetiques ou naturels) de differentes compositions, determinees par analyse chimique et spectroscopie infrarouge. Les decalages de la temperature de la transition α-β, produits par des concentrations importantes d'impuretes ont ete mesures. Les proprietes de la phase incommensurable sont tres sensibles a la presence de faibles taux d'impuretes: des hysteresis globales variant de 10 a 220 mK, ont ete mesurees et une correlation avec l'absorption infrarouge due aux liaisons OH a ete trouvee. Des effets dependant du temps tels que des marches d'accrochages et des effets memoires ont ete observes, montrant l'importance des defauts mobiles. Enfin, un regime de variations discontinues des proprietes physiques apparait pour les petites vitesses de variation de la temperature. Les resultats de ces experiences ont ete compares a diverses predictions theoriques, telles que celles de la theorie des Ondes de Densite des Defauts dues a la diffusion des impuretes mobiles","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"34 1","pages":"1939-1960"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89667898","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510180210100
D. Pine, D. Weitz, J. Zhu, E. Herbolzheimer
Dynamic light scattering is extended to optically thick (opaque) media which exhibit a very high degree of multiple scattering. This new technique, called diffusing-wave spectroscopy (DWS), exploits the diffusive nature of the transport of light in strongly scattering media to relate the temporal fluctuations of the multiply scattered light to the motion of the scatterers. A simple theory of DWS, based on the diffusion approximation for the transport of light, is developed to calculate the temporal electric field autocorrelation functions of the multiply scattered light. Two important scattering geometries are treated : transmission and backscattering. The theory is compared to experimental measurements of Brownian motion of submicron-diameter polystyrene spheres in aqueous suspension. The agreement between theory and experiment is excellent. The limitations of the photon diffusion approximation and the polarization dependence of the autocorrelation functions are discussed for the backscattering measurements. The effects of absorption of light and particle polydispersity are also incorporated into the theory and verified experimentally. It is also shown how DWS can be used to obtain information about the mean size of the particles which scatter light.
{"title":"Diffusing-wave spectroscopy : dynamic light scattering in the multiple scattering limit","authors":"D. Pine, D. Weitz, J. Zhu, E. Herbolzheimer","doi":"10.1051/JPHYS:0199000510180210100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510180210100","url":null,"abstract":"Dynamic light scattering is extended to optically thick (opaque) media which exhibit a very high degree of multiple scattering. This new technique, called diffusing-wave spectroscopy (DWS), exploits the diffusive nature of the transport of light in strongly scattering media to relate the temporal fluctuations of the multiply scattered light to the motion of the scatterers. A simple theory of DWS, based on the diffusion approximation for the transport of light, is developed to calculate the temporal electric field autocorrelation functions of the multiply scattered light. Two important scattering geometries are treated : transmission and backscattering. The theory is compared to experimental measurements of Brownian motion of submicron-diameter polystyrene spheres in aqueous suspension. The agreement between theory and experiment is excellent. The limitations of the photon diffusion approximation and the polarization dependence of the autocorrelation functions are discussed for the backscattering measurements. The effects of absorption of light and particle polydispersity are also incorporated into the theory and verified experimentally. It is also shown how DWS can be used to obtain information about the mean size of the particles which scatter light.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"18 1","pages":"2101-2127"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75401256","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170183100
M. Mézard
We study numerically directed polymers in a random potential in 1 + 1 dimensions. We introduce two copies of the polymer, coupled through a thermodynamic local interaction. We show that the system is unstable versus an arbitrary weak repulsion of the two copies. This suggests a similarity with a spin glass phase, with several « valleys », where the typical differences of the free energies of the valleys grow like t03C9, where t is the length of the polymer and 03C9 is probably equal to 1/3. The effect of a transverse electric field is studied in details showing the existence of strong fluctuations from sample to sample in the corresponding susceptibility. The results of the simulations are compared to analytic computations using the quantum mechanical formulation of the problem and the Bethe Ansatz.
{"title":"On the glassy nature of random directed polymers in two dimensions","authors":"M. Mézard","doi":"10.1051/JPHYS:0199000510170183100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170183100","url":null,"abstract":"We study numerically directed polymers in a random potential in 1 + 1 dimensions. We introduce two copies of the polymer, coupled through a thermodynamic local interaction. We show that the system is unstable versus an arbitrary weak repulsion of the two copies. This suggests a similarity with a spin glass phase, with several « valleys », where the typical differences of the free energies of the valleys grow like t03C9, where t is the length of the polymer and 03C9 is probably equal to 1/3. The effect of a transverse electric field is studied in details showing the existence of strong fluctuations from sample to sample in the corresponding susceptibility. The results of the simulations are compared to analytic computations using the quantum mechanical formulation of the problem and the Bethe Ansatz.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"2 1","pages":"1831-1846"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89770946","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170187700
S. Caracciolo, Giorgio Parisi, S. Patarnello, N. Sourlas
We present the results of two sets of numerical simulations of 3-d Ising spin-glasses in the presence of an uniform magnetic field. In the first set, among other quantities, we compute the spin-spin overlap probability distribution P(q), the link-link overlap probability distribution P e (q e ) and the spin-glass susceptibility χ SG for different volumes and temperatures. The results are in good agreement with mean-field behaviour: P(q) and P e (q e ) are non trivial and non self-averaging and χ SG shows an increase with the linear size L of the system as χ SG ∼Lω. Our estimate is ω=1,8±0.25 at T=0.83. In the second set of simulations a small coupling ∈ is introduced between two copies of the system and the copy overlap Q(e) is computed as a function of e. Q(e) becomes steeper around e∼0 as L increases, in agreement with the previous set of simulations. Our data seem anyhow incompatible with the alternatives to mean-field theory proposed so far Nous presentons les resultats de deux ensembles de simulations numeriques de verres de spins d'Ising tridimensionnels en presence d'un champ magnetique. Dans le premier ensemble nous calculons, entre autres quantites, la distribution de probabilite du recouvrement des configurations des spins P (q), la distribution de probabilite du recouvrement des configurations des liens P e (q e ) et la susceptibilite verre de spin X SG pour differents volumes et temperatures. Les resultats sont en bon accord avec la theorie du champ moyen: P(q) et P e (q e ) sont non triviaux et non automoyennants et χ SG augmente avec la taille lineaire L du systeme comme χ SG ∼Lω. Nous estimons ω=1,8±0,25 a T=0,83. Dans le deuxieme ensemble de simulations nous introduisons un petit couplage e entre deux copies du systeme et leur recouvrement Q (e) est calcule en fonction d'e• La pente de Q(e) a l'origine augmente avec L, en accord avec les autres simulations
本文给出了均匀磁场作用下三维伊辛自旋玻璃的两组数值模拟结果。在第一组中，我们计算了不同体积和温度下的自旋-自旋重叠概率分布P(q)、链路-链路重叠概率分布pe (q e)和自旋-玻璃磁化率χ SG。结果很好地符合平均场行为:P(q)和pe (q e)是非平凡的和非自平均的，并且χ SG随着系统的线性大小L (χ SG ~ Lω)而增加。我们估计在T=0.83时ω= 1.8±0.25。在第二组模拟中，在系统的两个副本之间引入了一个小的耦合∈，并且复制重叠Q(e)作为e的函数计算。随着L的增加，Q(e)在e ~ 0附近变得更陡，与前一组模拟一致。无论如何，我们的数据似乎与迄今为止提出的平均场理论的替代方案不相容:Nous提出的结果是:deux ensembles、desimulation、numerques、de verres、de spins、d'Ising三维空间、en presence、d' champ magnetique。在不同的体积和温度下，我们得到了最基本的系综物理计算，中心量，自旋的概率分布P (q)，自旋的概率分布P (q)，自旋的磁化率分布P (q)和自旋的磁化率X (SG)。结果表明:P(q) et P(q) et P(q) et P(q) sont non triviaux et non - automoyants et χ SG增强平均值la tailleaire L du system comme χ SG ~ Lω。努斯估计ω=1,8±0,25 a T=0,83。本文提出了一种基于小耦合的双副本系统集成仿真方法，并引入了双副本系统的最小补偿Q(e)和计算函数Q(e)，并给出了最小补偿Q(e)和原始增强平均值l，符合最小补偿仿真
{"title":"Low temperature behaviour of 3-D spin glasses in a magnetic field","authors":"S. Caracciolo, Giorgio Parisi, S. Patarnello, N. Sourlas","doi":"10.1051/JPHYS:0199000510170187700","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170187700","url":null,"abstract":"We present the results of two sets of numerical simulations of 3-d Ising spin-glasses in the presence of an uniform magnetic field. In the first set, among other quantities, we compute the spin-spin overlap probability distribution P(q), the link-link overlap probability distribution P e (q e ) and the spin-glass susceptibility χ SG for different volumes and temperatures. The results are in good agreement with mean-field behaviour: P(q) and P e (q e ) are non trivial and non self-averaging and χ SG shows an increase with the linear size L of the system as χ SG ∼Lω. Our estimate is ω=1,8±0.25 at T=0.83. In the second set of simulations a small coupling ∈ is introduced between two copies of the system and the copy overlap Q(e) is computed as a function of e. Q(e) becomes steeper around e∼0 as L increases, in agreement with the previous set of simulations. Our data seem anyhow incompatible with the alternatives to mean-field theory proposed so far Nous presentons les resultats de deux ensembles de simulations numeriques de verres de spins d'Ising tridimensionnels en presence d'un champ magnetique. Dans le premier ensemble nous calculons, entre autres quantites, la distribution de probabilite du recouvrement des configurations des spins P (q), la distribution de probabilite du recouvrement des configurations des liens P e (q e ) et la susceptibilite verre de spin X SG pour differents volumes et temperatures. Les resultats sont en bon accord avec la theorie du champ moyen: P(q) et P e (q e ) sont non triviaux et non automoyennants et χ SG augmente avec la taille lineaire L du systeme comme χ SG ∼Lω. Nous estimons ω=1,8±0,25 a T=0,83. Dans le deuxieme ensemble de simulations nous introduisons un petit couplage e entre deux copies du systeme et leur recouvrement Q (e) est calcule en fonction d'e• La pente de Q(e) a l'origine augmente avec L, en accord avec les autres simulations","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"58 1","pages":"1877-1895"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84867502","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170178100
D. Jérome
{"title":"Editorial - Forthcoming Changes to the Journal de Physique","authors":"D. Jérome","doi":"10.1051/JPHYS:0199000510170178100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170178100","url":null,"abstract":"","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"339 1","pages":"1781-1782"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76390389","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170179100
K. Parlinski, E. Denoyer, M. Lambert
A two-dimensional model of large (L) and small (S) atoms interacting via the Lennard-Jones potential has been studied by the molecular-dynamics technique. Slow cooling of the system L 0.435 S 0.565 from a disordered configuration leads to a defected quasicrystalline phase. Another run in which the L atoms were additionally interacting by the orientational three body potential, produced a phase with microcrystalline precipitates. This phase still preserves the pentagonal symmetry of the diffraction pattern. The crystalline precipitates have a unit cell of thin Penrose rhombuses Etude par la technique de dynamique moleculaire d'un modele bidimensionnel de gros atomes (L) et de petits atomes (S) en interaction via le potentiel de Lennard-Jones. Un refroidissement lent du systeme L 0,435 S 0,565 conduit a une phase quasicristalline
用分子动力学方法研究了大(L)原子和小(S)原子通过Lennard-Jones势相互作用的二维模型。从无序结构缓慢冷却系统L 0.435 S 0.565导致有缺陷的准晶相。另一次运行中，L原子与取向三体电位相互作用，产生了微晶沉淀相。这一相仍然保持了衍射图的五角形对称性。结晶沉淀具有薄的彭罗斯菱形单元胞。通过Lennard-Jones电势相互作用，采用分子动力学技术建立了大原子(L)和小原子(S)的二维模型。不制冷借给系统l0435 s0565导管单相准晶
{"title":"On the molecular-dynamics study of a phase transition in a quasicrystal model","authors":"K. Parlinski, E. Denoyer, M. Lambert","doi":"10.1051/JPHYS:0199000510170179100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170179100","url":null,"abstract":"A two-dimensional model of large (L) and small (S) atoms interacting via the Lennard-Jones potential has been studied by the molecular-dynamics technique. Slow cooling of the system L 0.435 S 0.565 from a disordered configuration leads to a defected quasicrystalline phase. Another run in which the L atoms were additionally interacting by the orientational three body potential, produced a phase with microcrystalline precipitates. This phase still preserves the pentagonal symmetry of the diffraction pattern. The crystalline precipitates have a unit cell of thin Penrose rhombuses Etude par la technique de dynamique moleculaire d'un modele bidimensionnel de gros atomes (L) et de petits atomes (S) en interaction via le potentiel de Lennard-Jones. Un refroidissement lent du systeme L 0,435 S 0,565 conduit a une phase quasicristalline","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"223 1","pages":"1791-1796"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76691398","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170198700
J. Menaucourt, C. Bockel
La physisorption de xenon sur la face (0001) du graphite recouverte d'hexafluorure de soufre (SF 6 ) egalement physisorbe a ete etudiee par volumetrie entre 80 et 112 K. La presence de SF 6 contrarie fortement l'adsorption de xenon. Celui-ci ne s'adsorbe de facon importante qu'a des pressions nettement plus elevees que sur graphite nu en deplacant le film de SF 6 au cours d'une transition de phase du premier ordre. L'evolution de la pression de la transition de deplacement avec la temperature est vraisemblablement liee aux differentes structures que presente le film de SF 6 sur graphite nu
{"title":"Déplacement par le xénon, du film d'hexafluorure de soufre préalablement adsorbé sur la face (0001) du graphite","authors":"J. Menaucourt, C. Bockel","doi":"10.1051/JPHYS:0199000510170198700","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170198700","url":null,"abstract":"La physisorption de xenon sur la face (0001) du graphite recouverte d'hexafluorure de soufre (SF 6 ) egalement physisorbe a ete etudiee par volumetrie entre 80 et 112 K. La presence de SF 6 contrarie fortement l'adsorption de xenon. Celui-ci ne s'adsorbe de facon importante qu'a des pressions nettement plus elevees que sur graphite nu en deplacant le film de SF 6 au cours d'une transition de phase du premier ordre. L'evolution de la pression de la transition de deplacement avec la temperature est vraisemblablement liee aux differentes structures que presente le film de SF 6 sur graphite nu","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"88 1","pages":"1987-2003"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76262833","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170189700
M. Lichtenberg, L. Oger, A. Gervois
La mesure des intercepts engendres dans des empilements granulaires par des coupes lineaires aleatoires peut fournir plus simplement que des sections planes certaines informations concernant la geometrie de ces milieux. La methode, deja testee sur des empilements de grains spheriques durs est ici utilisee pour determiner le nombre moyen de «cous» par grain dans un modele classique de materiau legerement fritte
{"title":"1D stereological cuts: application to sligthly sintered model materials","authors":"M. Lichtenberg, L. Oger, A. Gervois","doi":"10.1051/JPHYS:0199000510170189700","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170189700","url":null,"abstract":"La mesure des intercepts engendres dans des empilements granulaires par des coupes lineaires aleatoires peut fournir plus simplement que des sections planes certaines informations concernant la geometrie de ces milieux. La methode, deja testee sur des empilements de grains spheriques durs est ici utilisee pour determiner le nombre moyen de «cous» par grain dans un modele classique de materiau legerement fritte","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"22 1","pages":"1897-1910"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76952878","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 : 1990-09-01DOI: 10.1051/JPHYS:0199000510170197100
A. Buzdin, D. Feinberg
A multilayered superconducting system with a purely electromagnetic coupling between layers is considered. A general formula is derived for the energy of an arbitrary configuration of point vortices localized in the layers. It is shown that the interaction energy of a vortex and an antivortex located on the same layer depends logarithmically on their distance for large distances. The structure of a vortex line in perpendicular fields is also considered. Two different regimes appear, depending on the ratio of the interlayer distance d to the effective one-layer screening length λ eff = λ 2L/ d0 where λL is the London screening length in the layers and do the layer thickness. Due to the temperature dependence of λL, the behaviour of the first critical field H c1 is expected to show a crossover below Tc.
{"title":"Electromagnetic interaction of vortices in layered superconducting structures","authors":"A. Buzdin, D. Feinberg","doi":"10.1051/JPHYS:0199000510170197100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510170197100","url":null,"abstract":"A multilayered superconducting system with a purely electromagnetic coupling between layers is considered. A general formula is derived for the energy of an arbitrary configuration of point vortices localized in the layers. It is shown that the interaction energy of a vortex and an antivortex located on the same layer depends logarithmically on their distance for large distances. The structure of a vortex line in perpendicular fields is also considered. Two different regimes appear, depending on the ratio of the interlayer distance d to the effective one-layer screening length λ eff = λ 2L/ d0 where λL is the London screening length in the layers and do the layer thickness. Due to the temperature dependence of λL, the behaviour of the first critical field H c1 is expected to show a crossover below Tc.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"20 1","pages":"1971-1978"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83933238","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}
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