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We extend the study of the Fermi surface instability of the Pomeranchuk typeinto systems with orbital band structures, which are common features intransition metal oxides. Band hybridization significantly shifts the spectraweight of the Landau interactions from the conventional s-wave channel tounconventional non-s-wave channels, which results in anisotropic (nematic)Fermi surface distortions even with ordinary interactions in solids. TheGinzburg-Landau free energy is constructed by coupling the charge-nematic,spin-nematic and ferromagnetic order parameters together, which shows thatnematic electron states can be induced by metamagnetism. The connection betweenthis mechanism to the anisotropic metamagnetc states observed inSr$_3$Ru$_2$O$_7$ at high magnetic fields is studied in a multi-band Hubbardmodel with the hybridized quasi-one dimensional $d_{xz}$ and $d_{yz}$-bands.

Unconventional metamagnetic electron states in orbital band systems