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Superconductivity in the Cu(Ir1-xPtx)2Se4 spinel

Abstract

We report the observation of superconductivity in the CuIr2Se4 spinel induced by partial substitution of Pt for Ir. The optimal doping level for superconductivity in Cu(Ir1-xPtx )2Se4 is x = 0.2, where Tc is 1.76 K. A superconducting Tc vs composition dome is established between the metallic, normal conductor CuIr2Se4 and semiconducting CuIrPtSe4. Electronic structure calculations show that the optimal Tc occurs near the electron count of a large peak in the calculated electronic density of states and that CuIrPtSe4 is a band-filled insulator. Characterization of the superconducting state in this heavy metal spinel through determination of C/ã Tc indicates that it is BCS-like. The relatively high upper critical field at the optimal superconducting composition [Hc2(0) = 3.2 T] is much larger than that reported for analogous rhodium spinels and is comparable to or exceeds the Pauli field (ì0HP ), suggesting that strong spin-orbit coupling may influence the superconducting state. Further, comparison to doped CuIr2S4 suggests that superconductivity in iridium spinels is not necessarily associated with the destabilization of a charge-ordered spin-paired state through doping.

Authors (8)

  • Photo of  Huixia Luo

    Huixia Luo

    • Princeton University, Princeton Department of Chemistry
  • Photo of  Lukas Müchler

    Lukas Müchler

    • Max-Planck-Institut für Chemische Physik Fester Stoffe, ..
  • Photo of  Leslie Schoop

    Leslie Schoop

    • Princeton University, Princeton Department of Chemistry
  • Photo of  Daigorou Hirai

    Daigorou Hirai

    • Princeton University, Princeton Department of Chemistry
  • Photo of  M. K. Fuccillo

    M. K. Fuccillo

    • Princeton University, Princeton Department of Chemistry
  • Photo of  Claudia Felser

    Claudia Felser

    • Princeton University Chemistry Department
  • Photo of  Robert J. Cava

    Robert J. Cava

    • Max-Planck-Institut f¨ur Chemische Physik Fester Stoffe ..

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
PHYSICAL REVIEW B no. 87, edition 21, pages 1 - 21,
ISSN: 2469-9950
Language:
English
Publication year:
2013
Bibliographic description:
Luo H., Klimczuk T., Müchler L., Schoop L., Hirai D., Fuccillo M., Felser C., Cava R.: Superconductivity in the Cu(Ir1-xPtx)2Se4 spinel// PHYSICAL REVIEW B. -Vol. 87, iss. 21 (2013), s.1-21
Verified by:
Gdańsk University of Technology

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