Possible singlet-to-triplet pairing transition in NaxCoO 2·yH2O

M. M. Maśka, M. Mierzejewski, B. Andrzejewski, M. L. Foo, Robert Joseph Cava, T. Klimczuk

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Abstract

We present precise measurements of the upper critical field (H c2) in the recently discovered cobalt oxide superconductor. We have found that the critical field has an unusual temperature dependence; namely, there is an abrupt change of the slope of Hc2(T) in a weak-field regime. In order to explain this result we have derived and solved Gor'kov equations on a triangular lattice. Our experimental results may be interpreted in terms of the field-induced transition from singlet to triplet superconductivity.

Original languageEnglish (US)
Article number144516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number14
DOIs
StatePublished - Oct 1 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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