Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide
L. Simonelli, T. Mizokawa, M. Moretti Sala, H. Takeya, Y. Mizuguchi, Y. Takano, G. Garbarino, G. Monaco, N. L. Saini
DOI 10.1103/PhysRevB.90.214516 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We have studied local magnetic moment and electronic phase separation in superconducting KxFe2−ySe2 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 (Tc) 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 Tc 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 the electronically inhomogeneous KxFe2−ySe2 system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| AxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
Similar papers
Direct observation of nanoscale interface phase in the superconducting chalcogenide KxFe2−ySe2 with intrinsic phase separation
similarity 0.97A. Ricci et al.
Source status unknown — claims are unverified
Unconventional superconducting gap via spin fluctuations in iron-vacancy-ordered AyFe2−xSe2
similarity 0.95Shin-Ming Huang & Chung-Yu Mou
Source status unknown — claims are unverified
Phase relations in KxFe2−ySe2 and the structure of superconducting KxFe2Se2 via high-resolution synchrotron diffraction
similarity 0.95Daniel P. Shoemaker et al.
Source status unknown — claims are unverified
Superconductivity at 32 K in single-crystalline RbxFe2−ySe2
similarity 0.94A. F. Wang et al.
Source status unknown — claims are unverified
Different response of superconductivity to the transition-metal impurities in K0.8Fe2−y−xMxSe2 (M = Cr, Mn, Co, Zn)
similarity 0.94Dian Tan et al.
Source status unknown — claims are unverified
Magnetic-field tuned anisotropy in superconducting RbxFe2−ySe2
similarity 0.94S. Bosma et al.
Source status unknown — claims are unverified