Vibronic excitation dynamics in orbitally degenerate correlated electron system

Article

关键词: TRANSITION-METAL OXIDES;    X-RAY-SCATTERING;    ELEMENTARY EXCITATIONS;    SPIN;    LAMNO3;    MANGANITES;    MODEL;    SPECTRA;    KCUF3;    ORDER;   

DOI  :  10.1103/PhysRevB.88.205110

来源: SCIE

【 摘 要 】

The orbital-lattice coupled excitation dynamics in orbitally degenerate correlated systems is examined. We present a theoretical framework where both local vibronic excitations and superexchange-type intersite interactions are treated on an equal footing. We generalize the spin-wave approximation so as to take local vibronic states into account. The present method is valid from weak to strong Jahn-Teller coupling magnitudes. Two characteristic excitation modes coexist, a low-energy dispersive mode and a high-energy multipeak mode; these are identified as a collective vibronic mode and Flanck-Condon excitations in a single Jahn-Teller center modified by the intersite interactions, respectively. The present formalism covers vibronic dynamics in several orbital-lattice coupled systems.

【 授权许可】

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