Theory of Magnetic Order in $ Fe_{1+y}Te_{1-x}Se_x$

Details Theory of Magnetic Order in $ Fe_{1+y}Te_{1-x}Se_x$ Theory of Magnetic Order in $ Fe_{1+y}Te_{1-x}Se_x$

2008-11-08

arxiv.org/abs/0811.1294v1

EPL 86 (2009) 67005

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

We develop a local spin model to explain the rich magnetic structures in the iron-based superconductors $Fe_{1+y}Te_{1-x}Se_x$. 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.

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