Nonmetallic Low-Temperature Normal State of K0.7Fe1.46Se1.85Te0.15
- Nonmetallic Low-Temperature Normal State of K0.7Fe1.46Se1.85Te0.15
- 류혜진; Kefeng Wang; Erik Kampert; M. Uhlarz; J.Warren; J.Wosnitza; C. Petrovic
- Issue Date
- Physical Review X
- VOL 4, NO 3, 031018
- The normal-state in-plane resistivity below the zero-field superconducting transition temperature T-c and the upper critical field mu(0) H-c2(T) was measured by suppressing superconductivity in pulsed magnetic fields for K0.70Fe1.46Se1.85Te0.15. The normal-state resistivity rho(ab) is found to increase logarithmically with decreasing temperature as (T/T-c) -> 0. Similar to granular metals, our results suggest that a superconductor-insulator transition below zero-field T-c may be induced in high magnetic fields. This is related to the intrinsic real-space phase-separated states common to all inhomogeneous superconductors.
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