Possible singlet to triplet pairing transition in NaxCoO2 H2O

Details Possible singlet to triplet pairing transition in NaxCoO2 H2O Possible singlet to triplet pairing transition in NaxCoO2 H2O

2004-02-19

arxiv.org/abs/cond-mat/0402503v2

Phys. Rev. B70, 144516 (2004)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures, revtex

Scientific paper

10.1103/PhysRevB.70.144516

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.

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