Orbital Fluctuation-Induced Triplet Superconductivity : Mechanism of Superconductivity in Sr2 RuO4
Tetsuya Takimoto
Abstract
The mechanism of superconductivity in Sr2 RuO4 is studied using a degenerate Hubbard model within the weak coupling theory. When the system approaches the orbital instability which is realized due to increasing the on-site Coulomb interaction between the electrons in the different orbitals, it is shown that the triplet superconductivity appears. This superconducting mechanism is only available in orbitally degenerate systems with multiple Fermi surfaces.
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