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Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

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Abstract

The temperature-dependent electronic transport on the superconducting and insulating sides of the superconductor-insulator transition in disordered quasi-two-dimensional textured FeSe thin films is reported. The transition is driven by a perpendicular magnetic field applied to a film with its thickness close to the critical thickness of the thickness-, i.e., disorder-induced transition. The resistance in the superconducting phase might be dominated by thermally assisted flux flow, and in the phase diagram a metallic phase might intervene between the superconducting and insulating state at very low temperatures. In the insulating phase, weak insulating behavior is observed that can be described by weak localization theory of bosons, thus supporting the bosonic description of the superconductor-insulator transition in FeSe thin films.

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Abbreviations

SIT:

Superconductor-insulator transition

2D:

Two dimensional

B-SIT:

Magnetic-field driven superconductor-insulator transition

TAFF:

Thermally assisted flux flow

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Acknowledgments

The authors would like to thank A. Beck and E.-P. Knaetsch for technical assistance.

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Authors and Affiliations

  1. Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021, Karlsruhe, Germany

    R. Schneider, A. G. Zaitsev, D. Fuchs & H. von Löhneysen

  2. Physikalisches Institut, Karlsruher Institut für Technologie, 76128, Karlsruhe, Germany

    H. von Löhneysen

Authors
  1. R. Schneider
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  2. A. G. Zaitsev
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  3. D. Fuchs
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  4. H. von Löhneysen
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Correspondence to R. Schneider.

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Schneider, R., Zaitsev, A.G., Fuchs, D. et al. Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field. J Low Temp Phys 178, 118–127 (2015). https://doi.org/10.1007/s10909-014-1227-0

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  • DOI: https://doi.org/10.1007/s10909-014-1227-0

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