Nonmetallic Low-Temperature Normal State of K0.70Fe1.46Se1.85Te0.15

Kefeng Wang; Hyejin Ryu; Erik Kampert; M. Uhlarz; J. Warren; J. Wosnitza; C. Petrovic

doi:10.1103/PhysRevX.4.031018

Nonmetallic Low-Temperature Normal State of K0.70Fe1.46Se1.85Te0.15

Superconductivity 2015-01-07 v1

Authors: Kefeng Wang , Hyejin Ryu , Erik Kampert , M. Uhlarz , J. Warren , J. Wosnitza , C. Petrovic

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Abstract

The normal-state in-plane resistivity below the zero-field superconducting transition temperature $T_c$ and the upper critical field Hc2 were 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 decrasing temperature as $\frac{T}{T_c}\rightarrow 0$ . 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.

Keywords

iron-based superconductors normal state resistivity superconductor-insulator transition pulsed magnetic fields phase separation inhomogeneous superconductors upper critical field

Cite

@article{arxiv.1408.0271,
  title  = {Nonmetallic Low-Temperature Normal State of K0.70Fe1.46Se1.85Te0.15},
  author = {Kefeng Wang and Hyejin Ryu and Erik Kampert and M. Uhlarz and J. Warren and J. Wosnitza and C. Petrovic},
  journal= {arXiv preprint arXiv:1408.0271},
  year   = {2015}
}

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6 pages, 4 figures

Nonmetallic Low-Temperature Normal State of K0.70Fe1.46Se1.85Te0.15

Abstract

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