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arXiv 0907.5333cond-mat.dis-nn
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海森伯自旋玻璃实验与手征有序方案

Heisenberg Spin Glass Experiments and the Chiral Ordering Scenario

I. A Campbell, Dorothée C. M. C. Petit

摘要:

概述了海森堡自旋玻璃材料的实验数据,以便与模型海森堡自旋玻璃的数值结果进行详细的比较,特别是参考由于Kawamura和合作者的手征驱动的有序转变方案。弱各向异性系统,实验表明临界指数是非常相似的模型海森堡手征有序过渡,但这是很大的不同,从伊辛自旋玻璃过渡的数值估计。再次弱各向异性海森堡自旋玻璃,实验扭矩数据显示,定义良好的场横向有序过渡到强的应用领域,在伊辛自旋玻璃的领域破坏秩序。当研究具有较强各向异性的样品时,临界和场内行为逐渐趋向于伊辛极限。可以得出结论,实验室海森堡自旋玻璃的基本物理镜像模型海森堡自旋玻璃,其中手征有序已被证明数字。

英文摘要:

An overview is given of experimental data on Heisenberg Spin Glass materials so as to make detailed comparisons with numerical results on model Heisenberg spin glasses, with particular reference to the chiral driven ordering transition scenario due to Kawamura and collaborators. On weak anisotropy systems, experiments show critical exponents which are very similar to those estimated numerically for the model Heisenberg chiral ordering transition but which are quite different from those at Ising spin glass transitions. Again on weak anisotropy Heisenberg spin glasses, experimental torque data show well defined in-field transverse ordering transitions up to strong applied fields, in contrast to Ising spin glasses where fields destroy ordering. When samples with stronger anisotropies are studied, critical and in-field behavior tend progressively towards the Ising limit. It can be concluded that the essential physics of laboratory Heisenberg spin glasses mirrors that of model Heisenberg spin glasses, where chiral ordering has been demonstrated numerically.

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