by Wei-Cheng Lee and Congjun Wu
We study the Fermi surface instability of the Pomeranchuk type in orbital
band systems. Band hybridization significantly enhances the Landau
interactions in non-$s$-wave channels and results in anisotropic (nematic)
Fermi surface distortions.The Ginzburg-Landau free energy is constructed
by coupling the charge-nematic, spin-nematic and ferromagnetic order
parameters together, which shows that nematic electron states can be
induced by metamagnetism.The connection between this mechanism to the
anisotropic states observed in Sr3Ru2O7 at high magnetic fields
is studied in a multi-band Hubbard model with the hybridized quasi-one
dimensional dxz and dyz-bands.