Possible singlet to triplet pairing transition in NaxCoO2 H2O

M. M. Maska; M. Mierzejewski; B. Andrzejewski; M. L. Foo; R. J. Cava; T. Klimczuk

doi:10.1103/PhysRevB.70.144516

Possible singlet to triplet pairing transition in NaxCoO2 H2O

Superconductivity 2009-11-10 v2 Strongly Correlated Electrons

Authors: M. M. Maska , M. Mierzejewski , B. Andrzejewski , M. L. Foo , R. J. Cava , T. Klimczuk

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Abstract

We present precise measurements of the upper critical field (Hc2) 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.

Keywords

superconductivity upper critical field triangular lattice Gor'kov equations singlet-triplet transition

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@article{arxiv.cond-mat/0402503,
  title  = {Possible singlet to triplet pairing transition in NaxCoO2 H2O},
  author = {M. M. Maska and M. Mierzejewski and B. Andrzejewski and M. L. Foo and R. J. Cava and T. Klimczuk},
  journal= {arXiv preprint arXiv:cond-mat/0402503},
  year   = {2009}
}

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6 pages, 5 figures, revtex

Possible singlet to triplet pairing transition in NaxCoO2 H2O

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