Phase diagram of the dilute magnet LiHo_xY_(1-x)F_4

A. Biltmo; P. Henelius

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Phase diagram of the dilute magnet LiHo_xY_(1-x)F_4

机译：稀磁铁LiHo_xY_（1-x）F_4的相图

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We study the effective long-range Ising dipole model with a local exchange interaction appropriate for the dilute magnetic compound LiHo_xY_(1-x)F_4. Our calculations yield a value of 0.12 K for the nearest-neighbor exchange interaction. Using a Monte Carlo method, we calculate the phase boundary T_c(x) between the ferromagnetic and paramagnetic phases. We demonstrate that the experimentally observed linear decrease in T_c with dilution is not the simple mean-field result, but a combination of the effects of fluctuations and the exchange interaction. Furthermore, we find a critical dilution x_c=0.21(2), below which there is no ordering. In agreement with recent Monte Carlo simulations on a similar model, we find no evidence of the experimentally observed freezing of the glassy state in our calculation. We apply the theory of Stephen and Aharony to LiHo_xY_(1-x)F_4 and find that the theory does predict a finite-temperature freezing of the spin glass. Reasons for the discrepancies are discussed.

机译：我们研究了适用于稀磁化合物LiHo_xY_（1-x）F_4的具有局部交换相互作用的有效长距离Ising偶极子模型。根据我们的计算，最近邻交换交互的值为0.12K。使用蒙特卡洛方法，我们计算出铁磁和顺磁相位之间的相位边界T_c（x）。我们证明，实验观察到的T_c随稀释度线性下降不是简单的平均场结果，而是波动和交换相互作用的综合作用。此外，我们发现临界稀释度x_c = 0.21（2），在此以下没有排序。与最近在类似模型上进行的蒙特卡洛模拟一致，我们在计算中没有发现实验观察到的玻璃态冻结的证据。我们将Stephen和Aharony的理论应用于LiHo_xY_（1-x）F_4，发现该理论确实预测了旋转玻璃的有限温度冻结。讨论了产生差异的原因。

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来源
《Physical review》 |2007年第5期|054423.1-054423.5|共5页
作者
A. Biltmo; P. Henelius;
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作者单位

Department of Theoretical Physics, Royal Institute of Technology, SE-106 91 Stockholm, Sweden;

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原文格式 PDF
正文语种 eng
中图分类固体物理学;
关键词
classical spin models; numerical simulation studies; spin glasses and other random magnets;

机译：经典自旋模型;数值模拟研究;自旋眼镜和其他随机磁铁;

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Phase diagram of the dilute magnet LiHo_xY_(1-x)F_4

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