Coexistence of localized and itinerant electronic states in the multiband iron-based superconductor FeSe0.42Te0.58
D. Arčon, P. Jeglič, A. Zorko, A. Potočnik, A. Y. Ganin, Y. Takabayashi, M. J. Rosseinsky, K. Prassides
DOI 10.1103/PhysRevB.82.140508 · 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 report X-band electron paramagnetic resonance (EPR) and T125e and S77e NMR measurements on single-crystalline superconducting FeSe0.42Te0.58 [Tc=11.5(1) K]. The data provide indications for the coexistence of intrinsic localized and itinerant electronic states. In the normal state, localized moments couple to itinerant electrons in the Fe(Se,Te) layers and affect the local spin susceptibility and spin fluctuations. Below Tc, spin fluctuations become rapidly suppressed and an unconventional superconducting state emerges in which 1/T1 is reduced at a much faster rate than expected for conventional s- or s±-wave symmetry. We suggest that the localized states arise from the strong electronic correlations within one of the Fe-derived bands. The multiband electronic structure together with the electronic correlations thus determine the normal and superconducting states of the FeSe1−xTex family, which appears much closer to other high-Tc superconductors than previously anticipated.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe0.42Te0.58 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure unresolved | onset |
| Fe1.01Se Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure unresolved | unknown |
Similar papers
Superconductivity close to magnetic instability in Fe(Se1−xTex)0.82
similarity 0.95M. H. Fang et al.
Source status unknown — claims are unverified
Effect of impurity substitution on band structure and mass renormalization of the correlated FeTe0.5Se0.5 superconductor
similarity 0.95S. Thirupathaiah et al.
Source status unknown — claims are unverified
Effect of pressure-driven local structural rearrangement on the superconducting properties of FeSe0.5Te0.5
similarity 0.95M. Bendele et al.
Source status unknown — claims are unverified
Evolution of the superconducting properties in FeSe1−xSx
similarity 0.95S. A. Moore et al.
Source status unknown — claims are unverified
Two-dimensional-like superconducting properties and weak antilocalization transport in FeSe0.4Te0.6 single crystals: Topology-driven magnetotransport
similarity 0.95Chin-Wei Lin et al.
Source status unknown — claims are unverified
Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5
similarity 0.95M. Bendele et al.
Source status unknown — claims are unverified