Theory of magnetic order in Fe1+yTe1- xSex

Chen Fang, B. Andrei Bernevig, Jiangping Hu

Research output: Contribution to journalArticle

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Abstract

We develop a local spin model to explain the rich magnetic structures in the iron-based 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.

Original languageEnglish (US)
Article number67005
JournalEPL
Volume86
Issue number6
DOIs
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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