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

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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
Issue number17
StatePublished - Nov 8 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Pressure-restored superconductivity in Cu-substituted FeSe'. Together they form a unique fingerprint.

Cite this