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Magnon excitations and the specific heat of EuxSr1- xS spin glasses in strong magnetic fields EuxSr1- xS自旋玻璃在强磁场中的磁振子激发和比热
Journal De Physique Lettres Pub Date : 1985-09-01 DOI: 10.1051/JPHYSLET:019850046017084500
U. Krey
{"title":"Magnon excitations and the specific heat of EuxSr1- xS spin glasses in strong magnetic fields","authors":"U. Krey","doi":"10.1051/JPHYSLET:019850046017084500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046017084500","url":null,"abstract":"The density of states of magnon-like excitations of Eu x Sr 1−x S spin glasses with x=0.25, 0.44 and 0.54 is calculated for very strong magnetic fields B, i.e. B>3 T. It is found that for these high fields the magnon-like excitations can be treated as non-interacting bosons up to temperatures far beyond the spin glass freezing temperature at B=0. From the density of states the magnetic part C H of the specific heat is calculated, without any fit-parameter. The results agree quantitatively with recent experiments, for T between 0.3 K and 5 K (10 K) in magnetic fields of 3.6 T (6.6 T) Etude des excitations de quasi-magnons dans ces composes pour x=0,25, 0,44 et 0,54 en champ magnetique intense (B>3 T). Traitement de ces quasi-magnons comme des bosons non interagissants bien au-dessous de la temperature de transition de verre de spin a B=0. Calcul, sans parametre ajustable, de la densite d'etats des magnons et de la chaleur massique magnetique","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"102 1","pages":"845-850"},"PeriodicalIF":0.0,"publicationDate":"1985-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85835668","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: 6
4 — d expansion for Anderson localization in a strong spin-orbit coupling case 强自旋-轨道耦合情况下安德森局域化的四维展开
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016071900
S. Hikami
{"title":"4 — d expansion for Anderson localization in a strong spin-orbit coupling case","authors":"S. Hikami","doi":"10.1051/JPHYSLET:019850046016071900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016071900","url":null,"abstract":"The problem of Anderson localization in a strong spin-orbit coupling case is studied by using a gauge invariant matrix model in e=4-d expansion. An infrared stable fixed point is present and this model belongs to the same universal class as a nonlinear σ model. An expression for the critical exponent of conductivity is obtained in the first order of the e-expansion Etude de cette localisation a l'aide d'un modele matriciel a invariance de jauge: presence d'un point fixe stable dans l'IR et appartenance du modele a la meme classe d'universalite que le modele σ non lineaire. Expression pour l'exposant de la conductivite au 1er ordre en e","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"56 1","pages":"719-722"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91063391","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
Swelling of the various parts of a polymer chain in a good solvent 溶胀:聚合物链各部分在良好溶剂中的溶胀
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016075100
B. Duplantier
{"title":"Swelling of the various parts of a polymer chain in a good solvent","authors":"B. Duplantier","doi":"10.1051/JPHYSLET:019850046016075100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016075100","url":null,"abstract":"We consider an isolated polymer chain in a good solvent and calculate the swelling of an arbitrary part of it. We show that this swelling is much more important in the central part of the chain, and decreases abruptly when one reaches one of its extremities. We give the expressions of the averages of all the powers of the distance between two arbitrary points of the chain, at first order in e = 4 - d, d being the space dimension. Critical indices are deduced from it.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"9 1","pages":"751-758"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75438787","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
New electromechanical effect in chiral smectic C* liquid crystals 手性微晶C*液晶中的新机电效应
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016075900
A. Jákli, L. Bata, A. Buka, N. Éber, I. Jánossy
{"title":"New electromechanical effect in chiral smectic C* liquid crystals","authors":"A. Jákli, L. Bata, A. Buka, N. Éber, I. Jánossy","doi":"10.1051/JPHYSLET:019850046016075900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016075900","url":null,"abstract":"A new electromechanical effect has been found in planar oriented S c liquid crystals under the influence of an applied alternating electric field. A part from the well-known electrooptical effects a mechanical vibration has been observed in a direction parallel to the smectic layers and perpendicular to the electric field Observation de vibrations mecaniques induites par un champ electrique alternatif, dans la direction parallele aux couches smectiques et perpendiculairement au champ electrique","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"3 4","pages":"759-761"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72593447","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: 39
Frustration in polymers 聚合物中的挫折
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016072300
M. Kleman
{"title":"Frustration in polymers","authors":"M. Kleman","doi":"10.1051/JPHYSLET:019850046016072300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016072300","url":null,"abstract":"Etude theorique des ordres nematiques et cholesteriques des cristaux liquides polymeriques; suggestion des developpements relatifs a l'ordre local des polymeres fondus","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"51 1","pages":"723-732"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89441860","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: 24
Chauffage de particules dans une structure magnétique périodique 以周期性磁结构加热粒子
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016074500
C. Gonella, C. Gil, P. Louvet
{"title":"Chauffage de particules dans une structure magnétique périodique","authors":"C. Gonella, C. Gil, P. Louvet","doi":"10.1051/JPHYSLET:019850046016074500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016074500","url":null,"abstract":"When a particle beam is injected through a spatially periodic modulated mirror, under special initial conditions, one obtains a resonant exchange of energy from the longitudinal to the transverse component of the particle velocity. The equations of motion are solved and the growth of the Larmor radius is predicted Lorsque l'on injecte un faisceau de particules dans une structure periodique a miroirs faiblement modules, on obtient pour certaines conditions initiales un transfert d'energie resonnant entre energie longitudinale et transversale. La resolution des equations du mouvement permet de deduire la croissance du rayon de Larmor","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"26 1","pages":"745-749"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87525832","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
Energy barriers of the Ising model on percolation clusters : a numerical study 渗流团簇上Ising模型的能垒:数值研究
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015066700
R. Rammal, A. Benoît
{"title":"Energy barriers of the Ising model on percolation clusters : a numerical study","authors":"R. Rammal, A. Benoît","doi":"10.1051/JPHYSLET:019850046015066700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015066700","url":null,"abstract":"A new efficient algorithm for determining the energy barrier to overturn a finite cluster of ferromagnetic Ising spin is described. Percolation clusters at threshold are used to illustrate our method. We show in particular that the energy barrier scales logarithmically with the cluster size in contrast with the known power law behaviour on Euclidean lattices. Some of the consequences of this result for the kinetic Ising model on diluted ferromagnets are briefly discussed On decrit un nouvel algorithme efficace pour determiner la barriere d'energie de retournement d'un amas fini de spins d'Ising ferromagnetiques. Cette methode est illustree dans le cas des amas de percolation au seuil. On montre que la barriere augmente comme le logarithme de la taille au lieu d'une loi de puissance bien connue dans les reseaux euclidiens. Certaines consequences de ces resultats pour le modele d'Ising cinetique sur les ferromagnetiques dilues sont brievement discutees","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"43 1 1","pages":"667-673"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90032422","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: 17
Column undulation instability in a discotic liquid crystal 盘状液晶的柱波动不稳定性
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046015068300
M. Gharbia, M. Cagnon, G. Durand
{"title":"Column undulation instability in a discotic liquid crystal","authors":"M. Gharbia, M. Cagnon, G. Durand","doi":"10.1051/JPHYSLET:019850046015068300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046015068300","url":null,"abstract":"We present the first observation of an undulation instability of the columns in a tubular discotic liquid crystal when submitted to a dilation normal to the columns. This effect is very similar to the layer undulation in smectic materials. From the instability threshold and from the undulation wavelength, we derive a value, anomalously large, of the column curvature elastic constant, very close to the value obtained from observation of the column buckling under longitudinal compression. The static or dynamic origin of such a large curvature elastic constant is not understood Presentation de la premiere observation d'une instabilite d'ondulation des colonnes dans un cristal discotique tubulaire lorsqu'il est soumis a une dilatation normale aux colonnes. Deduction d'une valeur anormalement elevee de la constante elastique de courbure des colonnes a partir du seuil d'instabilite et de la longueur d'onde des ondulations","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"37 1","pages":"683-687"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90043926","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: 23
Spectral functions for a semi-infinite liquid 半无限液体的谱函数
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1051/JPHYSLET:019850046016073300
V. Velasco, F. García-Moliner
{"title":"Spectral functions for a semi-infinite liquid","authors":"V. Velasco, F. García-Moliner","doi":"10.1051/JPHYSLET:019850046016073300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046016073300","url":null,"abstract":"The surface contributions to the total density of states, which determine the temperature dependence of the surface specific heat, are very simply obtained by a direct application of the surface Green function matching analysis to an inviscid liquid. A discrepancy on the low temperature behaviour is resolved while showing the connection with the theory of another surface spectral function of physical interest Calcul des contributions de surface a la densite d'etats totale qui determine la variation thermique de la chaleur massique de surface, par application directe de la methode d'adaptation des fonctions de Green de surface du liquide non visqueux. Interpretation du comportement a basse temperature","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"R-32 1","pages":"733-735"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84758142","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
Stable Cycles with Complicated Structure 复杂结构的稳定循环
Journal De Physique Lettres Pub Date : 1985-08-01 DOI: 10.1007/978-94-009-3783-3_3
J. Gambaudo, P. Glendinning, C. Tresser
{"title":"Stable Cycles with Complicated Structure","authors":"J. Gambaudo, P. Glendinning, C. Tresser","doi":"10.1007/978-94-009-3783-3_3","DOIUrl":"https://doi.org/10.1007/978-94-009-3783-3_3","url":null,"abstract":"","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"11 1","pages":"41-62"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75194881","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: 20
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