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

## Author(s): Luo, Huixia; Klimczuk, Tomasz; Müchler, Lukas; Schoop, Leslie; Hirai, Daigorou; et al

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 Abstract: 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. © 2013 American Physical Society. Publication Date: Jun-2013 Electronic Publication Date: 14-Jun-2013 Citation: Luo, Huixia, Klimczuk, Tomasz, Müchler, Lukas, Schoop, Leslie, Hirai, Daigorou, Fuccillo, Michael K., Felser, Claudia, Cava, Robert J. (2013). Superconductivity in the Cu(Ir Pt ) Se spinel. Physical Review B, 87 (21), 10.1103/PhysRevB.87.214510 DOI: doi:10.1103/PhysRevB.87.214510 ISSN: 1098-0121 EISSN: 1550-235X Pages: 87.21:214510-1 - 214510-6 Type of Material: Journal Article Journal/Proceeding Title: Physical Review B Version: Final published version. Article is made available in OAR by the publisher's permission or policy. Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 87, Issue 21, 14 June 2013, Article number 214510.