Metal-Insulator Transition in Mn Perovskite Compounds
Yukitoshi Motome(1), Hiroki Nakano(2), Masatoshi Imada(2) ((1), Tokyo Inst. Technology, (2) ISSP, Univ. Tokyo)
TL;DR
This paper investigates the metal-insulator transition in Mn perovskite compounds using a model that incorporates orbital degeneracy, strong correlations, and Jahn-Teller effects, revealing key insights into their electronic phases.
Contribution
It introduces a comprehensive model combining strong correlation and Jahn-Teller coupling to explain experimental phenomena in Mn perovskites.
Findings
Synergy between correlations and Jahn-Teller effects reproduces charge gap and distortions.
Incoherent charge dynamics characterize the metallic phase.
Orbital correlations are critically enhanced near the insulator transition.
Abstract
We discuss Mott insulating and metallic phases of a model with orbital degeneracy to understand physics of Mn perovskite compounds. Quantum Monte Carlo and Lanczos diagonalization results are discussed in this model. To reproduce experimental results on charge gap and Jahn-Teller distortions, we show that a synergy between the strong correlation effects and the Jahn-Teller coupling is important. The incoherent charge dynamics and strong charge fluctuations are characteristic of the metallic phase accompanied with critical enhancement of short-ranged orbital correlation near the insulator.
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Taxonomy
TopicsMagnetic and transport properties of perovskites and related materials · Physics of Superconductivity and Magnetism · Advanced Chemical Physics Studies