2008/11/08 by Chen Fang, B. Andrei Bernevig, Jiangping Hu · 1 citation
Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Crystal (programming language) #Frustration #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Order (exchange) #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/86/67005
published as EPL 86 (2009) 67005 · 5 pages, 4 figures
arxiv created 2008/11/08 · openalex publication_date 2009/06/01 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.