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Abstrakt
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.
Autorzy (8)
-
Huixia Luo
- Princeton University, Princeton Department of Chemistry
-
Lukas Müchler
- Max-Planck-Institut für Chemische Physik Fester Stoffe, ..
-
Leslie Schoop
- Princeton University, Princeton Department of Chemistry
-
Daigorou Hirai
- Princeton University, Princeton Department of Chemistry
-
M. K. Fuccillo
- Princeton University, Princeton Department of Chemistry
-
Claudia Felser
- Princeton University Chemistry Department
-
Robert J. Cava
- Max-Planck-Institut f¨ur Chemische Physik Fester Stoffe ..
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Pełna treść
- Wersja publikacji
- Accepted albo Published Version
- Licencja
- Copyright (2013 American Physical Society)
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuł w czasopiśmie wyróżnionym w JCR
- Opublikowano w:
-
PHYSICAL REVIEW B
nr 87,
wydanie 21,
strony 1 - 21,
ISSN: 2469-9950 - Język:
- angielski
- Rok wydania:
- 2013
- Opis bibliograficzny:
- 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
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 125 razy
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