Coherence Lengths for Superconductivity in the Two-Orbital Negative-U Hubbard Model |
| G. Litaka, T. Ördb, K. Rägob and A. Varguninb
aFaculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, PL-20618 Lublin, Poland bInstitute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia |
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| 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. |
| DOI: 10.12693/APhysPolA.121.747 PACS numbers: 74.20.-z, 74.20.Mn, 74.25.-q |