Static and dynamic evidence for a transition at Tc = 0 in the Ising spin glass Fe0.3Mg0.7Cl2

Journal De Physique Pub Date : 1990-09-01 DOI:10.1051/JPHYS:0199000510170191100

J. Redoulès, R. Bendaoud, A. Fert, D. Bertrand, J. Vétel, J. Lasjaunias, J. Souletie, J. Ferré

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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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Ising自旋玻璃Fe0.3Mg0.7Cl2在Tc = 0处发生跃迁的静态和动态证据

用直流磁化、交流磁化率和比热测量等方法研究了Ising自旋玻璃Fe 0.3 Mg 0.7 Cl 2的临界性能。我们通过使用一种利用16位模拟数字转换器的新设置，将我们以前的交流磁化率测量范围扩展到0.02 Hz。弛豫时间τ和非线性磁化率系数a3和a5是彼此的幂函数，并像θ/T的指数函数一样发散。这证实了我们之前的说法，即Fe 0.3 Mg 0.7 Cl 2属于与传统三维体系不同的一类，并作为一个实际的二维Ising自旋玻璃的例子，其tc =0。我们认为，基本的L’etude du comcomement critique du verre de spin Ising Fe 0.3 Mg 0.7是由L’etude de measuring d’amationd’amationd、敏感性alternative和挑战特异性实现的。Les测量的敏感替代效应仅为3个低音频率(0.02Hz

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Journal De Physique

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