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Anomalous Transport Phenomena in Eu-Chalcogenide Alloys

T. KASUYA and A. YANASE

T. KASUYA and A. YANASE

  • Department of Physics, Tohoku University, Sendai, Japan

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Rev. Mod. Phys. 40, 684 – Published 1 October, 1968

DOI: https://doi.org/10.1103/RevModPhys.40.684

Abstract

Various anomalous optical, magnetic, and transport phenomena have been found in Eu-chalcogenide alloys. Anomalous optical properties are explained by the magnetic exciton in which a hole in the 4f conduction band and an electron (for optically active magnetic exciton) in the 5d conduction band make a bound state. Strong d−f exchange interaction between the magnetic-exciton electron of 5d character and the 4f electrons in the surrounding Eu2+ ions is the origin of the anomaly. Anomalous magnetic properties in dilute R3+ alloys are explained by the properties of the giant spin molecule which comes from the strong s−f exchange interaction between the impurity electron and the 4f electrons at the central R3+ and the surrounding Eu2+. The anomalous transition from the hopping type to the metallic-impurity band conduction in dilute R3+ alloys is also explained by the temperature dependence of the activation energy due to the s−f exchange interaction in the magnetic-impurity state.

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Rev. Mod. Phys. 40, 684– Published 1 October, 1968

    © 1968 American Physical Society

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