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Published on: August 22, 2015
Orbital nematic instability in the two-orbital Hubbard model: renormalization-group + constrained RPA analysis
Masahisa Tsuchiizu1, Yusuke Ohno, Seiichiro Onari
1Department of Physics, Nagoya University, Nagoya 464-8602, Japan.
Abstract:
Motivated by the nematic electronic fluid phase in Sr(3)Ru(2)O(7), we develop a combined scheme of the renormalization-group method and the random-phase-approximation-type method, and analyze orbital susceptibilities of the (d(xz), d(yz))-orbital Hubbard model with high accuracy. It is confirmed that the present model exhibits a 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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