Pressure-restored superconductivity in Cu-substituted FeSe

Leslie M. Schoop, Sergey A. Medvedev, Vadim Ksenofontov, Anthony Williams, Taras Palasyuk, Iwan A. Troyan, Jennifer Schmitt, Frederick Casper, Changhai Wang, Mikhail Eremets, R. J. Cava, Claudia Felser

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12 Scopus citations

Abstract

Copper doping of FeSe destroys its superconductivity at ambient pressure, even at low doping levels. Here we report the pressure-dependent transport and structural properties of Fe1.01-xCuxSe with 3% and 4% Cu doping and find that the superconductivity is restored. Metallic resistivity behavior, absent in Cu-doped FeSe, is also restored. At the low pressure of 1.5 GPa, superconductivity is seen at 6 K for 4% Cu doping, somewhat lower than the 8 K Tc of undoped FeSe. Tc reaches its maximum of 31.3 K at 7.8 GPa, lower than the maximum superconducting temperature in the undoped material under pressure (Tc max of 37 K) but still very high. X-ray diffraction shows that applied pressure decreases the lattice parameter in the basal plane, counteracting the structural effect of Cu doping, providing a possible explanation for the restoration of the superconductivity.

Original languageEnglish (US)
Article number174505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number17
DOIs
StatePublished - Nov 8 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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