Pub Date : 1999-03-01DOI: 10.1088/1004-423X/8/3/007
B. Laaboudi, M. Saber, A. Benaboud, M. Kerouad
The temperature dependences of the layer parameters σn,z= , mn,z= and qn,z= of a magnetic Ising superlattice consisting of two ferromagnetic Ising materials with spins μ=1/2 and S=1 respectively, on a simple cubic structure, are examined using the effective field theory based on the use of a probability distribution technique that correctly accounts for the single site kinematic relations. According to the values of the exchange interactions, different qualitative types of phase diagrams are expected.
{"title":"Temperature dependences of the order parameters of a magnetic Ising superlattice of two ferromagnet materials with spins μ=1/2 and S=1","authors":"B. Laaboudi, M. Saber, A. Benaboud, M. Kerouad","doi":"10.1088/1004-423X/8/3/007","DOIUrl":"https://doi.org/10.1088/1004-423X/8/3/007","url":null,"abstract":"The temperature dependences of the layer parameters σn,z= , mn,z= and qn,z= of a magnetic Ising superlattice consisting of two ferromagnetic Ising materials with spins μ=1/2 and S=1 respectively, on a simple cubic structure, are examined using the effective field theory based on the use of a probability distribution technique that correctly accounts for the single site kinematic relations. According to the values of the exchange interactions, different qualitative types of phase diagrams are expected.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121851308","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 : 1999-03-01DOI: 10.1088/1004-423X/8/3/009
Chen Xiao-bo, Chen Xiao-bo, Zhang Guang-Yin, Li Mei-Xian, Li Mei-Xian, L. Kun, Feng Yan, Bi Shi-zhang, Hao Zhao, Song Feng, Song Zeng-Fu, Meng Guang-zheng, Sun Yin-guan, Yang Zhan-Ru, Nie Yu-xin
This paper reports the upconversion luminescence phenomenon of crystal ErP5O14 in ultraviolet to blue-green wave range induced by red DCM dye laser. The upconversion passage of each upconversion fluorescence is confirmed. It is found that the upconversion mechanism is mainly non-resonant upconversion energy transfers between rare earth ions when laser wavelength is near 650 nm. It is very interesting that the non-resonant upconversion energy transfer is achieved directly through a kind of coupling state of rare earth ion cluster and the ions do not exchange their phonon energy with crystal lattice.
{"title":"Non-resonant upconversion energy transfer of crystal ErP5O14","authors":"Chen Xiao-bo, Chen Xiao-bo, Zhang Guang-Yin, Li Mei-Xian, Li Mei-Xian, L. Kun, Feng Yan, Bi Shi-zhang, Hao Zhao, Song Feng, Song Zeng-Fu, Meng Guang-zheng, Sun Yin-guan, Yang Zhan-Ru, Nie Yu-xin","doi":"10.1088/1004-423X/8/3/009","DOIUrl":"https://doi.org/10.1088/1004-423X/8/3/009","url":null,"abstract":"This paper reports the upconversion luminescence phenomenon of crystal ErP5O14 in ultraviolet to blue-green wave range induced by red DCM dye laser. The upconversion passage of each upconversion fluorescence is confirmed. It is found that the upconversion mechanism is mainly non-resonant upconversion energy transfers between rare earth ions when laser wavelength is near 650 nm. It is very interesting that the non-resonant upconversion energy transfer is achieved directly through a kind of coupling state of rare earth ion cluster and the ions do not exchange their phonon energy with crystal lattice.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126341252","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 : 1999-03-01DOI: 10.1088/1004-423X/8/3/006
W. Yi, Cheng Chuanyu, Hu Xiaowu, W. Kelin
Using 1+1 soliton-like polaron model of a deformable continuum, the critical temperature and the energy gap in high-temperature superconductors Y1-xCaxBa2Cu3-xMxO7-δ(M=Fe, Ni) are studied in the framework of finite temperature Green's function theory. The ratio 2Δ/kBTc=3.9 is obtained. Theoretical results are found in good agreement with the experimental data.
{"title":"A possible soliton-like polaron model for superconductors Y1-xCaxBa2Cu3-xMxO7-δ(M=Fe, Ni)","authors":"W. Yi, Cheng Chuanyu, Hu Xiaowu, W. Kelin","doi":"10.1088/1004-423X/8/3/006","DOIUrl":"https://doi.org/10.1088/1004-423X/8/3/006","url":null,"abstract":"Using 1+1 soliton-like polaron model of a deformable continuum, the critical temperature and the energy gap in high-temperature superconductors Y1-xCaxBa2Cu3-xMxO7-δ(M=Fe, Ni) are studied in the framework of finite temperature Green's function theory. The ratio 2Δ/kBTc=3.9 is obtained. Theoretical results are found in good agreement with the experimental data.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121988642","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 : 1999-03-01DOI: 10.1088/1004-423X/8/3/008
He Jun, Guo Hui-qun, Shen Bao-Gen, He Kaiyuan, L. Yi-hua, Hu Jifan
The microstructure, magnetic properties and the giant magneto-impedance (GMI) effect of the nanocrystalline (Fe1-xCox)(84)Zr3.5Nb3.5B8Cu1 ribbons have been studied. With increasing Co concentration, the nanocrystallized grain size and volume fraction of the alpha-Fe(Co) phase decrease under the same annealing condition, while the coercivity H-c increases from 1.92 A/m at x=0.0 to 30.38A/m at x=0.8. The effective permeability drops sharply with increasing Co concentration so that the GMI effect goes down. A value of more than 380 % for the magneto-impedance(MI) ratio was measured at frequency f=2.5 MHz and the sensitivity can reach 0.9% (A/m)(-1) for Fe84Zr3.5Nb3.5B8Cu1 ribbon. When a: is equal to 0.8, the MI ratio drops to about 30 % and the sensitivity only reaches a value of lower than 0.025% (A/m)(-1). The concise analysis in theory is also expounded.
研究了纳米晶(Fe1-xCox)(84)Zr3.5Nb3.5B8Cu1带的微观结构、磁性能和巨磁阻抗(GMI)效应。在相同退火条件下，随着Co浓度的增加，α - fe (Co)相的纳米晶晶粒尺寸和体积分数减小，矫顽力H-c从x=0.0时的1.92 A/m增加到x=0.8时的30.38A/m。随着Co浓度的增加，有效渗透率急剧下降，GMI效应减弱。在频率f=2.5 MHz时，测得Fe84Zr3.5Nb3.5B8Cu1带的磁阻抗比大于380%，灵敏度可达0.9% (A/m)(-1)。当a: = 0.8时，灵敏度下降到0.025% (a /m)以下(-1)。并从理论上进行了简明的分析。
{"title":"The influence of Co substitution on the magnetic properties and the giant magneto-impedance effect of (Fe 1-x Co x ) 84 Zr 3.5 Nb 3.5 B 8 Cu 1","authors":"He Jun, Guo Hui-qun, Shen Bao-Gen, He Kaiyuan, L. Yi-hua, Hu Jifan","doi":"10.1088/1004-423X/8/3/008","DOIUrl":"https://doi.org/10.1088/1004-423X/8/3/008","url":null,"abstract":"The microstructure, magnetic properties and the giant magneto-impedance (GMI) effect of the nanocrystalline (Fe1-xCox)(84)Zr3.5Nb3.5B8Cu1 ribbons have been studied. With increasing Co concentration, the nanocrystallized grain size and volume fraction of the alpha-Fe(Co) phase decrease under the same annealing condition, while the coercivity H-c increases from 1.92 A/m at x=0.0 to 30.38A/m at x=0.8. The effective permeability drops sharply with increasing Co concentration so that the GMI effect goes down. A value of more than 380 % for the magneto-impedance(MI) ratio was measured at frequency f=2.5 MHz and the sensitivity can reach 0.9% (A/m)(-1) for Fe84Zr3.5Nb3.5B8Cu1 ribbon. When a: is equal to 0.8, the MI ratio drops to about 30 % and the sensitivity only reaches a value of lower than 0.025% (A/m)(-1). The concise analysis in theory is also expounded.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131183330","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 : 1999-03-01DOI: 10.1088/1004-423X/8/3/003
Mei Dong-cheng, Xie Guang-zhong, Cao Li, Wu Da–jin
The stationary properties of a single-mode laser with positive and negative correlations between additive and multiplicative white-noise terms are investigated. By virtue of a simple rule and decoupling ansatz, the intensity correlation function and correlation time for the laser model are derived. We found that: (1) the fluctuation of light intensity with negative correlations between the noise terms are reduced in comparison with those for positive correlations; (2) the coupling between additive and multiplicative noises enhances the rate of decay of intensity correlation; (3) the effects of negative correlations between the noise terms are more remarkable than those of positive correlations.
{"title":"Effects of cross-correlated noises on a single-mode laser model: steady state analysis","authors":"Mei Dong-cheng, Xie Guang-zhong, Cao Li, Wu Da–jin","doi":"10.1088/1004-423X/8/3/003","DOIUrl":"https://doi.org/10.1088/1004-423X/8/3/003","url":null,"abstract":"The stationary properties of a single-mode laser with positive and negative correlations between additive and multiplicative white-noise terms are investigated. By virtue of a simple rule and decoupling ansatz, the intensity correlation function and correlation time for the laser model are derived. We found that: (1) the fluctuation of light intensity with negative correlations between the noise terms are reduced in comparison with those for positive correlations; (2) the coupling between additive and multiplicative noises enhances the rate of decay of intensity correlation; (3) the effects of negative correlations between the noise terms are more remarkable than those of positive correlations.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122603542","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 : 1999-03-01DOI: 10.1088/1004-423X/8/3/001
F. Hong-yi, Fan Yue
Using the technique of integration within an ordered product of operators, we construct a new common eigenvector set of the complex scalar fields (x) and † (x), which is a set of particle-antiparticle correlated states. On the basis of the new eigenstates we develop the path integral formulation. The new eigenvectors' properties are investigated, they are qualified to be a new representation.
{"title":"Path integral in correlated eigenstate basis of complex scalar fields ϕ(x) and ϕ † (x)","authors":"F. Hong-yi, Fan Yue","doi":"10.1088/1004-423X/8/3/001","DOIUrl":"https://doi.org/10.1088/1004-423X/8/3/001","url":null,"abstract":"Using the technique of integration within an ordered product of operators, we construct a new common eigenvector set of the complex scalar fields (x) and † (x), which is a set of particle-antiparticle correlated states. On the basis of the new eigenstates we develop the path integral formulation. The new eigenvectors' properties are investigated, they are qualified to be a new representation.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132848649","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 : 1999-02-20DOI: 10.1088/1004-423X/8/2/003
Zhang Zhong-can, Hu Chen-guo, Fang Zhen-yun
Using the path integral method, we calculated all the distribution probability ratios for the spin projection of the electron in a hydrogen atom under the disturbance of a strong periodic magnetic field, and studied the screening effect of the coupling of spin Ŝ with the periodic magnetic field B(t) on the ratios of the spin distributions. It is found that the screening exists not only in the usual direction along the magnetic field (not affected by initial conditions) but also other directions affected by the initial conditions. For the valence electron in the alkali metals, such as 3Li, 11Na, 19K, 37Ru, and 55Ce, etc., a similar conclusion can be drawn.
{"title":"SCREENING EFFECT OF THE SPIN DISTRIBUTION IN THE ATOMS OF HYDROGEN AND ALKALI METALS UNDER THE DISTURBANCE OF A STRONG PERIODIC MAGNETIC FIELD","authors":"Zhang Zhong-can, Hu Chen-guo, Fang Zhen-yun","doi":"10.1088/1004-423X/8/2/003","DOIUrl":"https://doi.org/10.1088/1004-423X/8/2/003","url":null,"abstract":"Using the path integral method, we calculated all the distribution probability ratios for the spin projection of the electron in a hydrogen atom under the disturbance of a strong periodic magnetic field, and studied the screening effect of the coupling of spin Ŝ with the periodic magnetic field B(t) on the ratios of the spin distributions. It is found that the screening exists not only in the usual direction along the magnetic field (not affected by initial conditions) but also other directions affected by the initial conditions. For the valence electron in the alkali metals, such as 3Li, 11Na, 19K, 37Ru, and 55Ce, etc., a similar conclusion can be drawn.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122994731","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 : 1999-02-20DOI: 10.1088/1004-423X/8/2/004
Wan Lang-hui, Zhu Jian-yang
By using the brick-wall model we calculate the free energy and the entropy including the superradiant effect mode of the scalar field in Demianski-Newman black hole. When the radial cut-off factor and the angular cut-off factor δ satisfy a proper relation, the entropy can be written as S = AH/4.
{"title":"Entropy in Demianski-Newman black hole.","authors":"Wan Lang-hui, Zhu Jian-yang","doi":"10.1088/1004-423X/8/2/004","DOIUrl":"https://doi.org/10.1088/1004-423X/8/2/004","url":null,"abstract":"By using the brick-wall model we calculate the free energy and the entropy including the superradiant effect mode of the scalar field in Demianski-Newman black hole. When the radial cut-off factor and the angular cut-off factor δ satisfy a proper relation, the entropy can be written as S = AH/4.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133249309","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 : 1999-02-20DOI: 10.1088/1004-423X/8/2/006
Chen Xiang-rong, Cheng Yan, L. Jun, Gou Qing-Quan, P. Xiao-feng
The highly excited vibrational energy levels of SiH stretches of silane SiH4 in the electronic ground state are calculated using a three-parameter nonlinear model, i.e., the quantized discrete self-trapping equation. The obtained results are in good agreements with the experimental data and with those obtained from local mode calculations of others. We note that SiH4 molecule is a typical molecule close to the local mode limit, and that when n ≥ 3, the molecule could be thought of as vibrating with the four SiH stretching quanta trapped into a single SiH bond.
{"title":"A nonlinear model for highly excited vibrational energy levels of silane","authors":"Chen Xiang-rong, Cheng Yan, L. Jun, Gou Qing-Quan, P. Xiao-feng","doi":"10.1088/1004-423X/8/2/006","DOIUrl":"https://doi.org/10.1088/1004-423X/8/2/006","url":null,"abstract":"The highly excited vibrational energy levels of SiH stretches of silane SiH4 in the electronic ground state are calculated using a three-parameter nonlinear model, i.e., the quantized discrete self-trapping equation. The obtained results are in good agreements with the experimental data and with those obtained from local mode calculations of others. We note that SiH4 molecule is a typical molecule close to the local mode limit, and that when n ≥ 3, the molecule could be thought of as vibrating with the four SiH stretching quanta trapped into a single SiH bond.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123585376","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 : 1999-02-01DOI: 10.1088/1004-423X/8/2/008
Hu Xiang-ming, Peng Jin-sheng
The effect of the pump phase diffusion on the linewidth of a laser without inversion is studied. It is shown that the linewidth at equal intensity may be reduced below that for a coherent driving, enen if the net effect of the pump bandwidth leads to an increase in the linewidth. The physical mechanism is analyzed in the dressed-state picture. Furthermore, the effects of the pump phase noise on the linewidths of an inversionleess laser and a Raman laser are compared with each other.
{"title":"Linewidth reduction in an inversionless laser with pump phase fluctuations","authors":"Hu Xiang-ming, Peng Jin-sheng","doi":"10.1088/1004-423X/8/2/008","DOIUrl":"https://doi.org/10.1088/1004-423X/8/2/008","url":null,"abstract":"The effect of the pump phase diffusion on the linewidth of a laser without inversion is studied. It is shown that the linewidth at equal intensity may be reduced below that for a coherent driving, enen if the net effect of the pump bandwidth leads to an increase in the linewidth. The physical mechanism is analyzed in the dressed-state picture. Furthermore, the effects of the pump phase noise on the linewidths of an inversionleess laser and a Raman laser are compared with each other.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126025768","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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