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arXiv 0910.0893cond-mat.dis-nn
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电介质和自旋玻璃中的关联随机场

Correlated random fields in dielectric and spin glasses

M. Schechter, P. C. E. Stamp

摘要:

取向玻璃和偶极玻璃都具有本征的随机场,它来自于杂质离子和主体离子之间的体积差。我们表明,这抑制了玻璃化转变,而不是导致交叉到低$T$阶段。此外,随机场与杂质间的相互作用相关,并且具有广泛的分布。这导致了伊姆里-马机制的一个特殊变体,杂质的“域”由几个冻结对定向。这些域是小的:域的大小的预测给出了特定的系统,并概述了其可能的实验验证。在零场的磁性玻璃中,玻璃转变仍然存在,因为时间反演对称性不允许随机场;施加磁场则产生随机场,并抑制自旋玻璃转变。

英文摘要:

Both orientational glasses and dipolar glasses possess an intrinsic random field, coming from the volume difference between impurity and host ions. We show this suppresses the glass transition, causing instead a crossover to the low $T$ phase. Moreover the random field is correlated with the inter-impurity interactions, and has a broad distribution. This leads to a peculiar variant of the Imry-Ma mechanism, with 'domains' of impurities oriented by a few frozen pairs. These domains are small: predictions of domain size are given for specific systems, and their possible experimental verification is outlined. In magnetic glasses in zero field the glass transition survives, because the random fields are disallowed by time-reversal symmetry; applying a magnetic field then generates random fields, and suppresses the spin glass transition.

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