{"title":"Effects of the growth mechanism on the structure of aggregation clusters","authors":"M. Kolb","doi":"10.1051/JPHYSLET:019850046014063100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046014063100","url":null,"abstract":"Angular correlations are calculated inside aggregation clusters of diffusion limited particle (PA) and cluster (CA) aggregation. The aggregates are isotropic for CA but anisotropic for PA, scaling differently parallel and perpendicular to the direction of growth. The correlation function exponents in two dimensions differ by ΔA=0,16±0,05 in the two directions. This leads to correction to scaling effects, especially for growth on a lattice Les correlations angulaires sont calculees a l'interieur des amas obtenus par collage de particules (PA) et par collage d'amas (CA). Alors que les amas sont isotropes pour CA, ils sont anisotropes pour PA. Les exposants de la fonction de correlation en deux dimensions, parallele et perpendiculaire a la direction de croissance, different de ΔA=0,16±0,05 pour Pa. Ceci introduit des corrections aux lois d'echelle.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"27 1","pages":"631-637"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88626096","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}
{"title":"Swelling of an isolated polymer chain in a solvent","authors":"J. D. Cloizeaux, R. Conte, G. Jannink","doi":"10.1051/JPHYSLET:019850046013059500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013059500","url":null,"abstract":"In the framework of the continuous model, a precise expression of the swelling of an isolated polymer in solution is given for all values of the interaction. The perturbation series obtained by Muthukumar and Nickel (1984) constitutes the initial data and a « direct renormalization method » is used to get the final result (in three dimensions).","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"48 1","pages":"595-600"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76267410","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}
{"title":"Anomalous diffusion on a selfsimilar hierarchical structure","authors":"S. Grossmann, F. Wegner, K. Hoffmann","doi":"10.1051/JPHYSLET:019850046013057500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013057500","url":null,"abstract":"The temporal increase of the moments in diffusion on a fractal with variable hopping range and lower cut-off is given. The essential parameters are the growth ratio, the length scaling and, as a new feature, the time scaling along the hierarchy. We find algebraical or exponential increase, logarithmic corrections, or trapping if the cut-off is removed. For the first time anomalous enhancement of the variance increase σ'0 tθ, θ larger than 2, is obtained as observed in turbulence On etudie la croissance temporelle des moments de la distribution de particules diffusant sur un fractal a portee de saut variable avec une coupure inferieure. Les parametres essentiels sont: le taux de croissance, le facteur d'echelle de la longueur et celui du temps le long de la hierarchie, ce dernier critere est nouveau. On trouve des lois de croissance algebriques et exponentielles et des corrections logarithmiques, ou un piegeage si la coupure est eliminee. Une augmentation anormale du taux de croissance de la variance σαtθ, θ>2, comme cela a deja ete observe pour la turbulence, est obtenue pour la 1ere fois","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"193 1","pages":"575-583"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75698307","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}
{"title":"Two alpha, three alpha and multiple heavy-ion radioactivities","authors":"D. Poenaru, M. Ivaşcu","doi":"10.1051/JPHYSLET:019850046013059100","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013059100","url":null,"abstract":"Résumé. 2014 La possibilité de nouveaux modes de radioactivité par émission spontanée de deux ou trois particules 03B1 ou de deux ions lourds identiques ou différents est envisagée. La variante analytique du modèle de la fission super-asymétrique est utilisée pour estimer les durées de vie. Abstract. 2014 New decay modes by spontaneous emission of two and three 03B1 particles and two iden-tical or different heavy ions, are predicted. The analytical variant of the superasymmetric fission model is used to estimate the half lives.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"54 1","pages":"591-594"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74630767","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}
{"title":"A random fuse model for breaking processes","authors":"L. Arcangelis, S. Redner, H. Herrmann","doi":"10.1051/JPHYSLET:019850046013058500","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013058500","url":null,"abstract":"We introduce and study a simple idealized model to describe breaking processes by analysing the current-carrying properties of a random network consisting of insulators and fuses. By increasing the value of the external voltage applied across the network, a sequence of fuses will « burn out » and change irreversible into insultating bonds. This process terminates when a conducting path no longer exists in the network. We monitor several basic quantities during this breaking process, such as the conductivity of the network and the value of the voltage needed to break the hottest fuse. Two new exponents describing the behaviour of these quantities near the percolation threshold are reported.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"14 1","pages":"585-590"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82501386","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}
{"title":"Kinetics of collapse for a flexible coil","authors":"P. Gennes","doi":"10.1051/JPHYSLET:019850046014063900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046014063900","url":null,"abstract":"If a polymer chain is transferred abruptly from θ conditions to bad solvent conditions (e.g. by a shift of temperature ΔT) it collapses with a certain characteristic time τc. We propose a scaling structure for τc, based on an « expanding sausage model », and taking into account the hydrodynamic interactions. We find that τ c ≅ τR ΔT/θ where τR is the Rouse time of the θ chain : the time τc increases with the depth of quench.","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"57 1","pages":"639-642"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79804839","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}
{"title":"Observation of 1/f magnetic fluctuations in a spin glass","authors":"M. Ocio, H. Bouchiat, P. Monod","doi":"10.1051/JPHYSLET:019850046014064700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046014064700","url":null,"abstract":"We observe spontaneous magnetic fluctuations at 4,2 K in zero field for the amorphous spin glass (Al 2 O 3 ) 0,1 (MNO) 0,5 (SiO 2 ) 0,4 and for the crystalline spin glass compound CsNiFeF 6 . In both cases the noise power spectrum exhibits an 1/f dependence in the range 10 −2 Hz to 10 2 Hz. The 1/f noise amplitude is in good agreement with the measured value of the out of phase susceptibility. This observation supports the applicability of the fluctuation dissipation theorem to spin glasses and suggests the magnetic noise as a new area of investigation Observation de fluctuations spontanees de l'aimantation a 4,2 K, en champ nul, dans le verre de spin amorphe (Al 2 O 3 ) 0,1 (MnO) 0,5 (SiO 2 ) 0,4 et dans le verre de spin cristallin CsNiFeF 6 : variation en 1/F de la densite spectrale pour des frequences de 10 −2 −10 2 Hz","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"39 1","pages":"647-652"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78213734","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}
{"title":"Back to the problem of the upper critical fields in organic superconductors","authors":"L. Gor’kov, D. Jérome","doi":"10.1051/JPHYSLET:019850046014064300","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046014064300","url":null,"abstract":"It is shown that the properties of the upper critical fields in organic superconductors can be understood in terms of pure TYPE II superconductivity. The experimental observation of high critical fields violating Clogston's criterion could give support in favour of triplet-paired superconductivity Etude theorique montrant que les valeurs des champs critiques superieurs peuvent s'interpreter dans le cadre de la theorie des supraconducteurs propres de type II. Possibilite d'existence du supraconduction avec couplage triplet si l'on observe des valeurs depassant la limite de Clogston","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"111 1","pages":"643-646"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82350072","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}
J. Bonnet, M. Boissier, J. Pelous, R. Vacher, Pl. E. Bataillon, Montpellier Cédex, France M. Descamps, J. L. Sauvajol
{"title":"« Glassy » and plastic crystals of cyanoadamantane : a Brillouin scattering investigation","authors":"J. Bonnet, M. Boissier, J. Pelous, R. Vacher, Pl. E. Bataillon, Montpellier Cédex, France M. Descamps, J. L. Sauvajol","doi":"10.1051/JPHYSLET:019850046013061700","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046013061700","url":null,"abstract":"The elastic constants of cyanoadamantane have been measured in the plastic and «glassy» crystal phases. A special attention has been given to the temperature evolution of C 11 as well as to the damping of the corresponding mode. Comparison with neutron results shows a strong dispersion at room temperature. The temperature dependence of C 11 in the plastic phase has been explained by the setting-up of a local antiferro ordering of molecules Determination des constantes d'elasticite d'apres les mesures de diffusion Brillouin sur monocristal entre 80 et 435 K. Variation thermique de C 11 et attenuation du mode correspondant. Comparaison aux donnees de diffusion de neutrons: existence d'une forte dispersion a temperature ambiante. Explication de la variation thermique de C 11 en phase plastique par apparition d'un ordre moleculaire local de type antiferro","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"17 1","pages":"617-621"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86156448","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}
C. Marcenat, A. Benoît, A. Briggs, C. Arzoumanian, A. D. Goër, F. Holtzberg
{"title":"Magnetic excitations of a Heisenberg spin glass : evidence for a gap in high magnetic fields","authors":"C. Marcenat, A. Benoît, A. Briggs, C. Arzoumanian, A. D. Goër, F. Holtzberg","doi":"10.1051/JPHYSLET:019850046012056900","DOIUrl":"https://doi.org/10.1051/JPHYSLET:019850046012056900","url":null,"abstract":"Measurements of the specific heat C(T) of a spin glass Eu 0.44 Sr 0.56 S single crystal have been performed between 0.7 and 10 K, and with applied magnetic fields (H=0, 4, 6 and 7 T). The application of a large magnetic field strongly modifies the C(T) behaviour, with a large decrease at low temperatures: the quasilinear variation observed in zero field is replaced by an exponential variation characteristic of the opening of a gap in the excitation spectrum. These results, together with those of magneto-thermal resistivity obtained previously, can be described with the assumption of two kinds of magnetic excitations: (i) very low energy collective excitations and (ii) single spin excitation of Eu 2+ ions in the external magnetic field augmented by some internal field of 3.2 T, the origin of which is discussed Mesures de chaleur massique sur un monocristal de verre de spin isolant Eu 0,44 Sr 0,56 S entre 0,7 et 10 K, sous champ magnetique H(0 a 7 T): effet important du champ dur C(T) avec une tres forte diminution a basse temperature, la variation quasi lineaire en champ nul etant remplacee par une variation exponentielle, caracteristique de l'apparition d'une bande interdite dans le spectre des excitations. A l'aide de resultats anterieurs sur la conductivite thermique en champ magnetique, interpretation par deux types d'excitations magnetiques: collectives et d'ions Eu 2+","PeriodicalId":14822,"journal":{"name":"Journal De Physique Lettres","volume":"24 1","pages":"569-574"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76543139","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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