J. Redoulès, R. Bendaoud, A. Fert, D. Bertrand, J. Vétel, J. Lasjaunias, J. Souletie, J. Ferré
{"title":"Static and dynamic evidence for a transition at Tc = 0 in the Ising spin glass Fe0.3Mg0.7Cl2","authors":"J. Redoulès, R. Bendaoud, A. Fert, D. Bertrand, J. Vétel, J. Lasjaunias, J. Souletie, J. Ferré","doi":"10.1051/JPHYS:0199000510170191100","DOIUrl":null,"url":null,"abstract":"The critical behaviour of the Ising spin glass Fe 0.3 Mg 0.7 Cl 2 has been studied by d.c. magnetisation, a.c. susceptibility and specific heat measurements. We have extended the range of our previous a.c. susceptibility measurements down to 0.02 Hz by using a new set up which utilises the possibilities of a 16 bit analog to digital converter. The relaxation time τ and the coefficients a 3 and a 5 of the non linear susceptibilities are powers of each other and diverge like exponential functions of θ/T. This confirms our former statement that Fe 0.3 Mg 0.7 Cl 2 is of a class different from that of traditional 3d systems and appears as an example of a real 2d Ising spin glass with T c =0. We claim that the essential L'etude du comportement critique du verre de spin Ising Fe 0.3 Mg 0.7 a ete realisee a l'aide de mesures d'aimantation, de susceptibilite alternative et de chaleur specifique. Les mesures de susceptibilite alternative ont ete effectuees jusqu'a de tres basses frequences (0.02Hz<f<3000Hz) grâce a la mise au point d'un dispositif experimental utilisant un convertisseur analogique numerique 16 bits rapide. Le temps de relaxation τ comme les coefficients a 3 et a 5 de la susceptibilite non lineaire sont puissances l'un de l'autre et divergent comme des exponentielles de θ/T. L'analyse des resultats confirme donc les conclusions d'une premiere etude du comportement critique dynamique : Fe 0.30 Mg 0.70 Cl 2 appartient a une classe d'universalite differente des systemes 3d et apparait comme exemple de verre de spin 2d Ising caracterise par une transition de phase a T c =0. Nous affirmons que les singularites observees apparaissent comme la limite naturelle a T c =0 des lois habituelles de «scaling». Nous nous differencions sur ce point des analyses presentees recemment pour d'autres systemes, ou un comportement semblable est interprete par une theorie ad hoc pour T c =0","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"28 1","pages":"1911-1928"},"PeriodicalIF":0.0000,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal De Physique","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1051/JPHYS:0199000510170191100","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
The critical behaviour of the Ising spin glass Fe 0.3 Mg 0.7 Cl 2 has been studied by d.c. magnetisation, a.c. susceptibility and specific heat measurements. We have extended the range of our previous a.c. susceptibility measurements down to 0.02 Hz by using a new set up which utilises the possibilities of a 16 bit analog to digital converter. The relaxation time τ and the coefficients a 3 and a 5 of the non linear susceptibilities are powers of each other and diverge like exponential functions of θ/T. This confirms our former statement that Fe 0.3 Mg 0.7 Cl 2 is of a class different from that of traditional 3d systems and appears as an example of a real 2d Ising spin glass with T c =0. We claim that the essential L'etude du comportement critique du verre de spin Ising Fe 0.3 Mg 0.7 a ete realisee a l'aide de mesures d'aimantation, de susceptibilite alternative et de chaleur specifique. Les mesures de susceptibilite alternative ont ete effectuees jusqu'a de tres basses frequences (0.02Hz
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