| Issue |
EPL
Volume 86, Number 6, June 2009
|
|
|---|---|---|
| Article Number | 67005 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/86/67005 | |
| Published online | 09 July 2009 | |
Theory of magnetic order in Fe
Te
Sex
1
Department of Physics, Purdue University - West Lafayette, IN 47907, USA
2
Princeton Center for Theoretical Science, Princeton University - Princeton, NJ 08544, USA
Received:
26
January
2009
Accepted:
25
May
2009
We develop a local spin model to explain the rich magnetic structures in the iron-based superconductors FeTeSex. 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.
PACS: 74.25.Ha – Magnetic properties / 71.10.-w – Theories and models of many-electron systems / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2009
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