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Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide
- Source :
- Phys. Rev. B 90, 214516 (2014)
- Publication Year :
- 2015
-
Abstract
- We have studied local magnetic moment and electronic phase separation in superconducting K$_{x}$Fe$_{2-y}$Se$_2$ by x-ray emission and absorption spectroscopy. Detailed temperature dependent measurements at the Fe K-edge have revealed coexisting electronic phases and their correlation with the transport properties. By cooling down, the local magnetic moment of Fe shows a sharp drop across the superconducting transition temperature (T$_c$) and the coexisting phases exchange spectral weights with the low spin state gaining intensity at the expense of the higher spin state. After annealing the sample across the iron-vacancy order temperature, the system does not recover the initial state and the spectral weight anomaly at T$_c$ as well as superconductivity disappear. The results clearly underline that the coexistence of the low spin and high spin phases and the transitions between them provide unusual magnetic fluctuations and have a fundamental role in the superconducting mechanism of electronically inhomogeneous K$_{x}$Fe$_{2-y}$Se$_2$ system.<br />Comment: 6 pages, 5 figures
- Subjects :
- Condensed Matter - Superconductivity
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 90, 214516 (2014)
- Publication Type :
- Report
- Accession number :
- edsarx.1501.01558
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.90.214516