Low temperature electronic properties of Sr_2RuO_4 II: Superconductivity

Details Low temperature electronic properties of Sr_2RuO_4 II: Superconductivity Low temperature electronic properties of Sr_2RuO_4 II: Superconductivity

2002-08-15

arxiv.org/abs/cond-mat/0208307v1

Phys. Rev. B 67, 014505 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages REVTEX, 3 figures

Scientific paper

10.1103/PhysRevB.67.014505

The body centered tetragonal structure of Sr_2RuO_4 gives rise to umklapp scattering enhanced inter-plane pair correlations in the d_{yz} and d_{zx} orbitals. Based on symmetry arguments, Hund's rule coupling, and a bosonized description of the in-plane electron correlations the superconducting order parameter is found to be a orbital-singlet spin-triplet with two spatial components. The spatial anisotropy is 7%. The different components of the order parameter give rise to two-dimensional gapless fluctuations. The phase transition is of third order. The temperature dependence of the pair density, specific heat, NQR, Knight shift, and susceptibility are in agreement with experimental results.

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