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

Huixia Luo, Tomasz Klimczuk, Lukas Müchler, Leslie Schoop, Daigorou Hirai, M. K. Fuccillo, C. Felser, R. J. Cava

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We report the observation of superconductivity in the CuIr 2Se4 spinel induced by partial substitution of Pt for Ir. The optimal doping level for superconductivity in Cu(Ir1-xPt x)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 ΔC/γTc 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 (μ0HP), 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.

Original languageEnglish (US)
Article number214510
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number21
StatePublished - Jun 14 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Superconductivity in the Cu(Ir1-xPtx) 2Se4 spinel'. Together they form a unique fingerprint.

Cite this