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Coherence Lengths for Superconductivity in the Two-Orbital Negative-U Hubbard Model

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Litak G., Örd T., Rägo K., Vargunin A.

Acta Physica Polonica A

2012

vol. 121

issue 4

747-751

We study the peculiarities of coherency in the superconductivity of two-orbital system. The superconducting phase transition is caused here by the on-site intra-orbital attractions (negative-U Hubbard model) and inter-orbital pair-transfer interaction. The dependencies of critical and non-critical correlation lengths on interaction channels and band fillings are analyzed.

Van Hove Singularity and Superconductivity in Disordered Sr_{2}RuO_{4}

100%

Litak G., Annett J., Györffy B.

Acta Physica Polonica A

2000

vol. 97

issue 1

249-252

On the basis of a simple model we analyse the influence of disorder on critical temperature T_{c} in p-wave superconductors. The disorder is treated by means of the coherent potential approximation and we focus our attention on the effect of a van Hove singularity near Fermi energy E_{F}. For the appropriate values of its parameters our model reproduces the experimentally found behaviour of Sr_{2} RuO_{4}.

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2 Acta Physica Polonica A

1 2012

1 2000

2 Litak G.

1 Annett J.

1 Györffy B.

1 Rägo K.

1 Vargunin A.

1 Örd T.

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Coherence Lengths for Superconductivity in the Two-Orbital Negative-U Hubbard Model

Van Hove Singularity and Superconductivity in Disordered Sr_{2}RuO_{4}