Monte Carlo study of doping change and disorder effect on double-exchange ferromagnetism

2003/05/02 by Yukitoshi Motome, Nobuo Furukawa · 3 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.stat-mech #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.68.144432

published as Phys. Rev. B 68, 144432 (2003) · 7 pages including 8 figures

arxiv created 2003/05/02 · openalex publication_date 2003/10/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 experimental results in the colossal magnetoresistance manganites.

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• Disorder-induced orbital ordering in doped manganites
• Magnons in ferromagnetic metallic manganites
• An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites
• First-order nature of the ferromagnetic phase transition in(La‐Ca)MnO3near optimal doping

Related

• Thermodynamics of the Double Exchange Systems
• Critical Exponents for the Ferromagnetism in Colossal Magnetoresistance Manganites
• Ground State of the Double Exchange Model
• Competing Orders and Disorder-Induced Insulator to Metal Transition in Manganites
• Disorder in Diluted Spin Systems