Coexistence of - and -wave gaps due to pair-hopping and exchange interactions
arXiv:2107.11036 · doi:10.1088/1361-648X/ac123b
Abstract
I investigate the superconductivity of the three-band -- model derived from the three-band Hubbard model using the Schrieffer-Wolff transformation. My model is designed considering the hole-doped high- superconducting cup-rate. The model does not exclude the double occupancy of Cu sites by electrons, and there is a pair-hopping interaction between the and bands together with the exchange interaction. I analyse the superconducting transition temperature, electronic state, and superconducting gap function based on strong coupling theory and find that the superconductivity emerges due to the pair-hopping and exchange interactions via the Suhl-Kondo mechanism. In the superconducting state, the extended - and -wave superconducting gaps coexist, where both charge fluctuations and - band hybridization are key ingredients.
arXiv comment19 pages, 7 figures
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