Masahisa Tsuchiizu, Seiichiro Onari, Hiroshi Kontani
Motivated by the nematic electronic fluid phase in Sr_{3}Ru_{2}O_{7}, we analyze the (d_{xz},d_{yz})-orbital Hubbard model by the one-loop renormalization-group method. It is confirmed that the present model exhibits the ferro-orbital instability near the magnetic or superconducting quantum criticality, due to the Aslamazov-Larkin type vertex corrections. This mechanism of orbital nematic order presents a natural explanation for the nematic order in Sr_{3}Ru_{2}O_{7}, and is expected to be realized in various multiorbital systems, such as Fe-based superconductors.
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http://arxiv.org/abs/1209.3664
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