1997/09/30 by Naoto Nagaosa, Shuichi Murakami, Hyun Cheol Lee · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat
paper · pdf · doi:10.1103/physrevb.57.r6767
REVTEX
arxiv created 1997/09/30 · openalex publication_date 1998/03/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The interplay between the electron repulsion U and the Jahn-Teller electron-phonon interaction ELR is studied with a large-d model for the ferromagnetic state of the manganese oxides. These two interactions collaborate to induce local isospin (orbital) moments and to reduce the bandwidth B. The retardation effect of the Jahn-Teller phonon with frequency \ensuremathΩ is especially important in reducing B, and a strong \ensuremathΩ dependence occurs even when the Coulomb interaction is dominant (U\ensuremath≫ELR), as long as ELR>\ensuremathΩ. The phonon spectrum consists of two components: a temperature-independent sharp peak at \ensuremathω=\stackrel\ifmmode \else \~\fi\ensuremathΩ=\ensuremathΩ[(U+4ELR)/U]1/2 and one corresponding to the Kondo peak. A comparison of these results with experiments suggest that \ensuremathΩ<ELR<U in the metallic manganese oxides.