Monte Carlo Study of Doping Change and Disorder Effect on Double Exchange Ferromagnetism

Abstract

Phase diagram and critical properties are studied for three-dimensional double exchange model with and without quenched disorder. Employing the Monte Carlo method and the systematic analysis on the finite-size effect, we estimate the Curie temperature and the critical exponent as functions of the doping concentration and the strength of the random potential. The Curie temperature well scales to the kinetic energy of electrons in the ground state as expected for this kinetics-driven ferromagnetism. The universality class of this transition is described by the short-range Heisenberg fixed point. The results are compared with the experimental results in the colossal magnetoresistance manganites.

7 pages including 8 figures

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• Fragility of the A-type AF and CE Phases of Manganites: An Exotic Insulator-to-Metal Transition Induced by Quenched Disorder
• Study of the One- and Two-Band Models for Colossal Magnetoresistive Manganites Using the Truncated Polynomial Expansion Method
• Colossal magnetoresistance and quenched disorder in manganese oxides
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• Relevance of quantum fluctuations in the Anderson-Kondo model
• Calculation of Dynamical and Many-Body Observables with the Polynomial Expansion Method for Spin-Fermion Models
• Disorder-induced orbital ordering in doped manganites
• An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites
• Polynomial Expansion Monte Carlo Study of Frustrated Itinerant Electron Systems: Application to a Spin-ice type Kondo Lattice Model on a Pyrochlore Lattice
• Strongly anharmonic collective modes in a coupled electron-phonon-spin problem
• Application of polynomial-expansion Monte Carlo method to a spin-ice Kondo lattice model
• On the reliability of recent Monte Carlo studies of dilute systems of localized spins interacting with itinerant carriers
• Antiferromagnetic topological insulators in heavy-fermion systems