Two-electronic component behavior in the multiband FeSe$_{0.42}$Te$_{0.58}$ superconductor

Arcon, D, Jeglic, P, Zorko, A, Potocnik, A, Ganin, AY, Takabayashi, Y, Rosseinsky, MJ ORCID: 0000-0002-1910-2483 and Prassides, K (2010) Two-electronic component behavior in the multiband FeSe$_{0.42}$Te$_{0.58}$ superconductor. Physical Review B, 82 (14). 140508-.

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Abstract

We report X-band EPR and $^{125}$Te and $^{77}$Se NMR measurements on single-crystalline superconducting FeSe$_{0.42}$Te$_{0.58}$ ($T_c$ = 11.5(1) K). The data provide evidence 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 $T_c$, spin fluctuations become rapidly suppressed and an unconventional superconducting state emerges in which $1/T_1$ is reduced at a much faster rate than expected for conventional $s$- or $s_\pm$-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 FeSe$_{1-x}$Te$_x$ family, which appears much closer to other high-$T_c$ superconductors than previously anticipated.

Item Type:	Article
Additional Information:	5 pages, 4 figures
Uncontrolled Keywords:	cond-mat.supr-con, cond-mat.supr-con
Depositing User:	Symplectic Admin
Date Deposited:	02 Aug 2016 13:48
Last Modified:	19 Jan 2023 07:32
DOI:	10.1103/physrevb.82.140508
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3002649