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Critical relaxation in three-dimensional spin glasses 三维自旋玻璃中的临界弛豫
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015069500
M. V. Feigel’man, L. Ioffe
{"title":"Critical relaxation in three-dimensional spin glasses","authors":"M. V. Feigel’man, L. Ioffe","doi":"10.1051/JPHYSLET:019850046015069500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015069500","url":null,"abstract":"The analytical theory of slow relaxation of the Ising and vector 3-D spin glasses with the finite range interaction near the freezing transition point T f has been developed. In the Ising case, the maximum relaxation time t max increases as t max ∼(T−T f ) −6 exp[C(T−T f ) −1/4 ]. For the Heisenberg spins t max ∼(T−T f ) −10.5 . It is shown that the inclusion of weak random-anisotropy exchange leads to the Ising asymptotics for t max in the Heisenberg spin glass Theorie analytique de la relaxation lente des verres de spin 3D vectoriels et de ceux d'Ising avec interaction de portee finie pres du point de transition de gel. Croissance du temps maximal de relaxation suivant (T-T f ) −6 exp(C(T−T f ) −1/4 ) dans le cas d'Ising et suivant (T−T f ) −10,5 dans le cas de Heisenberg. Par inclusion de l'echange d'anisotropie faible aleatoire, obtention d'un comportement asymptotique d'Ising pour les verres de spin d'Heisenberg","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"22 1","pages":"695-702"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81626100","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}
引用次数: 7
Inversions de population lors de la création, par interaction laser résonnante, de plasmas complètement ionisés 通过共振激光相互作用产生完全电离等离子体时的种群反转
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016073700
J. Bobin, M. Zaibi
{"title":"Inversions de population lors de la création, par interaction laser résonnante, de plasmas complètement ionisés","authors":"J. Bobin, M. Zaibi","doi":"10.1051/JPHYSLET:019850046016073700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016073700","url":null,"abstract":"Rate equations are investigated numerically. They evidence the importance at the beginning of ionization kinetics, of collisions between excited atomic species. Specially, energy pooling fills the 4D and 5S levels and consequently induces a strong population inversion. The transient inversion always takes place in the process which leads to complete ionization Un traitement numerique des equations d'evolution montre l'importance, pour le debut de la cinetique d'ionisation, des collisions entre especes atomiques excitees. En particulier, le processus d'«energy pooling» peuple fortement les niveaux 5S et 4D entrainant ainsi une forte densite d'inversion de population. Celle-ci apparait toujours mais de facon transitoire dans le processus qui conduit a l'ionisation complete","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"34 1","pages":"737-744"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88462475","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}
引用次数: 4
Hard rods on lattices 格子上的硬杆
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015065900
A. Baumgärtner
{"title":"Hard rods on lattices","authors":"A. Baumgärtner","doi":"10.1051/JPHYSLET:019850046015065900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015065900","url":null,"abstract":"Exact calculations and enumerations of systems of hard rigid rods distributed at closed packed density on L×L square lattices, where each rod occupies N ≤11/36 for L/N>2 and decreases continuously with increasing size of the system L/N for all N. The entropy per rod of our systems behaves as S N α N −1 ×ln N as N→∞. Hard rods on cubic lattices are also briefly considered. Some implications of our results are discussed with respect to liquid crystals, polymeric liquid crystals and current theories of polymer melting On presente des calculs exacts et des resultats d'enumeration pour des barres rigides distribuees a densite maximale sur des reseaux carres L×L. Chaque barre occupe N ≤11/36 pour L/N>2 et decroit continuement pour tout N lorsque le rapport L/N augmente. L'entropie par barre de nos systemes se comporte comme S N -N −1 Log N lorsque N→∞. Les barres rigides sur des reseaux cubiques sont aussi discutees. On considere quelques consequences de ces resultats sur la physique des cristaux liquides, des cristaux liquides polymeriques et sur les theories actuelles de la fusion des polymeres","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"10 1","pages":"659-666"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78977073","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}
引用次数: 9
Long polymers in good solvent : ε-expansion of the ratio of the radius of gyration to the end to end distance 长聚合物在良好溶剂中的膨胀:ε-旋转半径与端到端距离之比
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015068900
M. Benhamou, G. Mahoux
{"title":"Long polymers in good solvent : ε-expansion of the ratio of the radius of gyration to the end to end distance","authors":"M. Benhamou, G. Mahoux","doi":"10.1051/JPHYSLET:019850046015068900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015068900","url":null,"abstract":"The ratio of the radius of gyration to the mean square end to end distance of an isolated long chain is given to second order in e = 4 — d, where d is the space dimension. Our method of calculation is based on the direct renormalization idea introduced by J. des Cloizeaux. In dimension three (e = 1), our result can be compared with the result of computer experiments made by C. Domb and F. F. Hioe.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"45 1","pages":"689-693"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72992283","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}
引用次数: 26
Degeneracy of the crystal states and departure from the rigid band model for a strongly localized impurity 强定域杂质晶体态的简并和偏离刚性带模型
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015070300
S. Olszewski
{"title":"Degeneracy of the crystal states and departure from the rigid band model for a strongly localized impurity","authors":"S. Olszewski","doi":"10.1051/JPHYSLET:019850046015070300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015070300","url":null,"abstract":"A standard perturbation calculation is performed for a set of q degenerate states whose perturbation is a strongly localized impurity. The free-electron approximation and the LCAO approximation for the electron states are considered. The calculation which seems not to have been done before shows that there is precisely no change in the energy for q−1 states but a strong shift of energy for one state. This effect is fully independent of the size of the perturbation potential providing the perturbation calculation is applicable. At the same time the wave function corresponding to the shifted state is not a damped state but a simple superposition of the unperturbed band states. For a crystal having a spherical shape it can be shown that the charge distribution of the shifted state has an oscillatory decrease with the distance from the position of the impurity Calcul de perturbation standard pour un ensemble de q etats degeneres perturbes par une impurete fortement localisee, a l'approximation des electrons libres et a l'approximation LCAO: un des etats est fortement perturbe en energie alors que les (q−1) autres ne le sont pas, independamment de la taille du potentiel perturbateur, et l'etat deplace n'est pas localise mais est une combinaison d'etats de bande non perturbes","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"87 5-6","pages":"703-709"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91495453","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}
引用次数: 0
High resolution 13C NMR investigation in the organic conductor : (TMTSF)2ClO4 有机导体(TMTSF)2ClO4的高分辨率13C核磁共振研究
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015067500
P. Bernier, M. Audenaert, R. J. Schweizer, P. Stein, D. Jérome, K. Bechgaard, A. Moradpour
{"title":"High resolution 13C NMR investigation in the organic conductor : (TMTSF)2ClO4","authors":"P. Bernier, M. Audenaert, R. J. Schweizer, P. Stein, D. Jérome, K. Bechgaard, A. Moradpour","doi":"10.1051/JPHYSLET:019850046015067500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015067500","url":null,"abstract":"We report the results of 13 C NMR magic angle spinning experiments performed on the TMTSF molecule (in solution and in the solid state) and in the organic conductor (TMTSF) 2 ClO 4 . This investigation (Knight-shift, T 1 and T 1ρ ) has allowed to resolve all individual sites of the organic molecule. Strong and widely distributed enhancements of the relaxation rate of the nuclear spin on different sites of the molecule suggest a picture where Coulomb correlations play a major role for the sites at the corners of the molecule Etude de la RMN de 13 C, avec rotation a l'angle magique, pour la molecule TMTSF, en solution et a l'etat solide, et le conducteur organique. Identification de tous les sites individuels de la molecule a partir du deplacement de Kinght, de T 1 et T 1ρ . Observation d'une large distribution et d'une forte augmentation du taux de relaxation des spins des differents sites en relation avec le role important joue par les interactions coulombiennes","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"304 1","pages":"675-681"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76330613","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}
引用次数: 11
Cholesteric to cholesteric phase transitions in liquid crystals 液晶中胆甾相到胆甾相的转变
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015071100
H. Brand, H. Pleiner
{"title":"Cholesteric to cholesteric phase transitions in liquid crystals","authors":"H. Brand, H. Pleiner","doi":"10.1051/JPHYSLET:019850046015071100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015071100","url":null,"abstract":"We discuss the phase transitions which can occur between two different cholesteric phases and we present general symmetry arguments why this transition has to be always of the first order. We derive the macroscopic dynamics close to the phase transition and we propose an experiment to shift the critical temperature which makes use of a novel reversible cross coupling between the order parameter of the transition and inhomogeneous rotations Discussion sur les transitions pouvant apparaitre entre deux phases cholesteriques. On montre par des arguments de symetrie generale que cette transition doit toujours etre du premier ordre","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"162 1","pages":"711-718"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80228256","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}
引用次数: 10
6-dimensional properties of Al0.86Mn0.14 alloy Al0.86Mn0.14合金的六维性能
Journal De Physique Lettres Pub Date : 1985-07-01 DOI: 10.1051/JPHYSLET:019850046013060100
P. Kalugin, A. Kitayev, L. Levitov
{"title":"6-dimensional properties of Al0.86Mn0.14 alloy","authors":"P. Kalugin, A. Kitayev, L. Levitov","doi":"10.1051/JPHYSLET:019850046013060100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013060100","url":null,"abstract":"The general properties of the phases with the icosahedral point group and long-range orientational order are considered. 6 Goldstone modes ― 3 phonons and 3 phasons ― are shown to exist. A model for the microscopic structure ― a 6-D crystal ― is proposed, and phason modes are discussed in this framework. Bravais lattice types are determined and some physical phenomena due to the peculiar AlMn dimension 6 are listed. Simple Landau-theory type arguments for advantages of icosahedral structure are put forward Les proprietes generales des phases presentant un groupe ponctuel icosaedrique et un ordre orientationnel a grande distance sont etudiees ici. On montre l'existence de six modes de Goldstone ― 3 phonons et 3 phasons. Un modele pour la structure microscopique, cristalline dans un espace a six dimensions est propose et les modes phasons sont discutes dans ce cadre. Des reseaux de Bravais sont determines et certains phenomenes physiques de AlMn due a cette dimensions six sont soulignes. Des arguments simples, du type de la theorie de Landau, montrent pourquoi la structure icosaedrique est favorisee","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"6 1","pages":"601-607"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87505481","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}
引用次数: 158
Scaling laws for the attractors of Hopfield networks Hopfield网络吸引子的标度定律
Journal De Physique Lettres Pub Date : 1985-07-01 DOI: 10.1051/JPHYSLET:019850046014062300
G. Weisbuch, F. Fogelman-Soulié
{"title":"Scaling laws for the attractors of Hopfield networks","authors":"G. Weisbuch, F. Fogelman-Soulié","doi":"10.1051/JPHYSLET:019850046014062300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046014062300","url":null,"abstract":"Networks of threshold automata are random dynamical systems with a large number of attractors, which J. Hopfield proposed to use as associative memories. We establish the scaling laws relating the maximum number of «useful» attractors and the radius of the attraction basin to the number of automata. A by-product of our analysis is a better choice for thresholds which doubles the performances in terms of the maximum number of «useful» attractors Les reseaux d'automates a seuil sont des systemes dynamiques a structure aleatoire semblables aux verres de spins dont J. Hopfield a propose l'application comme memoires associatives. Nous etablissons les lois d'echelles reliant le nombre maximum d'attracteurs utiles et la distance d'attraction, au nombre des automates du reseau. Notre approche permet aussi un meilleur choix des seuils, ce qui double les performances du reseau en nombre d'attracteurs.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"6 1","pages":"623-630"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88184628","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}
引用次数: 100
Transition from L1 to L2 in a ternary system (OBS-pentanol-water): a borderline case between continuous and discontinuous topological inversion 三元体系(obs -戊醇-水)从L1到L2的过渡:连续和不连续拓扑反演之间的边界情况
Journal De Physique Lettres Pub Date : 1985-07-01 DOI: 10.1051/JPHYSLET:019850046013060900
P. Bassereau, J. Marignan, J. Appell, Groupe de Dynamique, Phases Condensées, Montpellier Cédex, Greco Microémulsions
{"title":"Transition from L1 to L2 in a ternary system (OBS-pentanol-water): a borderline case between continuous and discontinuous topological inversion","authors":"P. Bassereau, J. Marignan, J. Appell, Groupe de Dynamique, Phases Condensées, Montpellier Cédex, Greco Microémulsions","doi":"10.1051/JPHYSLET:019850046013060900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013060900","url":null,"abstract":"Le diagramme de phase du systeme ternaire OBS-pentanol-eau presente un etroit passage apparemment continu reliant les domaines d'existence de L 1 et de L 2 . Il presente aussi une petite region triphasique, qui est habituellement plutot caracteristique d'une situation ou L 1 et L 2 sont separes. Associes a ce caractere limite, des phenomenes physiques originaux sont observes et etudies dans le passage etroit. Un scenario plausible pour l'inversion topologique de structure est propose pour cette situation particuliere","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"69 1","pages":"609-616"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84771079","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}
引用次数: 1
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