Localization and Magnetic Interactions in Semimagnetic Semiconductors at Low Temperatures

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Abstract
Selected properties of I I–V I semiconducting compounds containing substitutional Mn or Fe are reviewed. The former (e.g.,Cd 1-x Mn x Te) can be classified as dilute Heisenberg antiferromagnets while some of the latter (e.g.,Hg 1-x Fe x Se) are mixed-valence systems. The origin of the sp–d and d–d exchange interactions in the Mn-based compounds and the influence of these interactions on low-temperature properties are discussed. Special attention is paid to experimental results and theoretical models which help to understand the striking behavior of doped magnetic semiconductors in the neighborhood of the Anderson-Mott transition. Low-temperature properties of Hg 1-x Fe x Se are presented emphasizing the experimental findings and theoretical ideas which point to a substantial reduction of the electron scattering rate in the mixed-valence region. An experimental result suggesting the existence of superconductivity in this material is discussed.

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