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- W4300356731 abstract "Leggett's mode is a collective excitation corresponding to the oscillation of the relative phase of the order parameters in a two band superconductor, with frequency proportional to interband coupling. We report on the existence of modes, similar to Leggett's mode, in magnetic systems with Jahn-Teller distortion. The minimal Kugel-Khomskii model, which describes simultaneously both the spin and the orbital order, is studied. The dynamical degrees of freedom are spin-$s$ operators of localized spins and pseudospin-$tau$ operators, which respond to the orbital degeneracy and satisfy the similar commutation relation with those of the spin operators. In the case of antiferro spin and pseudospin order the system possesses two antiferromagnetic magnons with equal spin-wave velocities and two Leggett's modes with equal gaps proportional to the square root of the spin-pseudospin interaction constant. In the case of ferro spin and pseudospin order the system possesses one ferromagnetic magnon and one Leggett's mode with gap proportional to the spin-pseudospin interaction constant." @default.
- W4300356731 created "2022-10-03" @default.
- W4300356731 creator A5015948997 @default.
- W4300356731 date "2013-11-12" @default.
- W4300356731 modified "2023-09-26" @default.
- W4300356731 title "Leggett's Modes in Magnetic Systems with Jahn-Teller distortion" @default.
- W4300356731 doi "https://doi.org/10.48550/arxiv.1311.2733" @default.
- W4300356731 hasPublicationYear "2013" @default.
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