STRONG FRUSTRATION AND DILUTION-ENHANCED ORDER IN A QUASI-2D SPIN-GLASS

被引：354

作者：

RAMIREZ, AP

ESPINOSA, GP

COOPER, AS

机构：

[1] ATandT Bell Laboratories, Murray Hill

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.64.2070

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The interactions in the magnetoplumbite isomorph SrCr8Ga4O19 are highly frustrated. Thermodynamic data are presented and show the existence of a transition from paramagnetic to spin-glass ordering but only at Tc=3.3 K, despite the high Curie-Weiss temperature of 515 K. Other unusual properties include a low-temperature specific heat varying as T2 and an inverse relationship of Tc to magnetic-ion concentration for a set of differently prepared crystals. This result is conjectured to arise from competition between 2D frustration and a tendency toward 3D order, controlled by preferential site substitution. © 1990 The American Physical Society.

引用

页码：2070 / 2073

页数：4

共 19 条

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