Theory of magnetic order in Fe1+yTe1-xSex

被引：63

作者：

Fang, Chen ^{[1
]}

Bernevig, B. Andrei ^{[2
]}

Hu, Jiangping ^{[1
]}

机构：

[1] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

[2] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA

来源：

EPL | 2009年 / 86卷 / 06期

关键词：

SUPERCONDUCTIVITY;

D O I：

10.1209/0295-5075/86/67005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We develop a local spin model to explain the rich magnetic structures in the ironbased superconductors Fe1+yTe1-xSex. We show that our model exhibits both commensurate antiferromagnetic and incommensurate magnetic order along the crystal a-axis. The transition from the commensurate to the incommensurate phase is induced when the concentration of excess Fe atoms is larger than a critical value. Experimentally measurable spin-wave features are calculated, and the mean-field phase diagram of the model is obtained. Our model also suggests the existence of a large quantum critical region due to strong spin frustration upon increasing Se concentration. Copyright (C) EPLA, 2009

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页数：5

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