6533b7d7fe1ef96bd1268376

RESEARCH PRODUCT

Double Exchange in Orbitally Degenerate Mixed Valence Clusters: Magnetic Anisotropy, Vibronic Effects

V. Yu. MirovitskiiJuan M. Clemente-juanEugenio CoronadoJuan J. Borrás-almenarB. S. TsukerblatAndrew Palii

subject

PhysicsMagnetic anisotropyValence (chemistry)Degenerate energy levelsCondensed Matter::Strongly Correlated ElectronsMolecular physicsTransition metal ions

description

In this paper we consider the vibronic problem of the double exchange in mixed-valence dimers containing transition metal ions in orbitally degenerate ground states. The vibronic model includes interaction with the breathing local modes (Piepho-Krausz-Schatz-PKS) as well as the modulation of metal-metal distances as suggested by Piepho. The double exchange in orbitally degenerate systems is shown to produce strong magnetic anisotropy of orbital nature. PKS interaction is expected to suppress the magnetic anisotropy of the system, while the intercenter vibrations tend to enhance it. The roles of spin-orbit coupling and temperature are revealed for the systems with different geometries.

yearjournalcountryeditionlanguage
2001-01-01
https://doi.org/10.1007/978-94-010-0985-0_12