Strong and nonmonotonic temperature dependence of Hall coefficient in superconducting KxFe2−ySe2 single crystals
Xiaxin Ding, Yiming Pan, Huan Yang, Hai-Hu Wen
DOI 10.1103/PhysRevB.89.224515 · 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
In-plane resistivity, magnetoresistance, and Hall-effect measurements have been conducted on quenched KxFe2−ySe2 single crystals in order to analyze the normal-state transport properties. It is found that Kohler's rule is well obeyed below about 80 K, but clearly violated above 80 K. Measurements of the Hall coefficient reveal a strong but nonmonotonic temperature dependence with a maximum at about 80 K, in contrast to any other FeAs-based superconductors. With the two-band model analysis on the Hall coefficient, we conclude that a gap may open below 65 K. The data above 65 K are interpreted as a temperature-induced crossover from a metallic state at a low temperature to an orbital-selective Mott phase at a high temperature. This is consistent with the recent data of angle-resolved photoemission spectroscopy. These results call for a refined theoretical understanding, especially when the hole pockets are absent or become trivial in KxFe2−ySe2 superconductors.
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 |
| Fe1-xSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| FeSe1-xTex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
Similar papers
Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide
similarity 0.97L. Simonelli et al.
Source status unknown — claims are unverified
Coexistence of superconductivity and magnetism in KxFe2−ySe2−zSz (z = 0,0.4)
similarity 0.95L. Li et al.
Source status unknown — claims are unverified
Local structural disorder and superconductivity in KxFe2−ySe2
similarity 0.95Hyejin Ryu (류혜진) et al.
Source status unknown — claims are unverified
Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals
similarity 0.95S. Teknowijoyo et al.
Source status unknown — claims are unverified
Superconductivity in monolayer FeSe enhanced by quantum geometry
similarity 0.95Taisei Kitamura et al.
Source status unknown — claims are unverified
Magnetic-field tuned anisotropy in superconducting RbxFe2−ySe2
similarity 0.95S. Bosma et al.
Source status unknown — claims are unverified