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Mixed-valence manganites

1999/03/01 by J. M. D. Coey, M. Viret, S. von Molnár · 2,487 citations
Materials Science · #Colossal magnetoresistance #Condensed matter physics #Curie temperature #Electron #Electronic and Structural Properties of Oxides #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic semiconductor #Magnetoresistance #Materials science #Multiferroics and related materials #Physics #Polaron #Valence (chemistry)

paper · doi:10.1080/000187399243455

published in Advances In Physics 48(2), 167-293 (Taylor & Francis)

openalex publication_date 1999/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

Mixed-valence manganese oxides (R1-χAχ)MnO3 (R=rare-earth cation, A=alkali or alkaline earth cation), with a structure similar to that of perovskite CaTiO3, exhibit a rich variety of crystallographic, electronic and magnetic phases. Historically they led to the formulation of new physical concepts such as double exchange and the Jahn-Teller polaron. More recent work on thin films has revealed new phenomena, including colossal magnetoresistance near the Curie temperature, dense granular magnetoresistance and optically-induced magnetic phase transitions. This review gives an account of the literature on mixed-valence manganites, placing new results in the context of established knowledge of these materials, and other magnetic semiconductors. Issues addressed include the nature of the electronic ground states, the metal-insulator transition as a function of temperature, pressure and applied magnetic field, the electronic transport mechanisms, dielectric and magnetic polaron formation, magnetic localization, the role of cation disorder and the Jahn-Teller effect. Sample preparation, and the properties of related ferromagnetic oxides are also discussed.

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