Abstract
MBE-grown (Ga,Cr)As has interesting electric and magnetic properties. Ga1−x Cr x As with x = 0.1 exhibits short-range ferromagnetic behavior at low temperatures. This is manifest in several anomalous properties: magnetization does not scale with B/T; fitting M(B) requires a model of distributed magnetic cluster or polarons; and inverse susceptibility is nonliner in T (non-Curie–Weiss) at low fields. At room temperature, the conductivity is activated and Hall measurements yield a hole concentration of ∼1020 cm−3, indicating that chromium acts as an acceptor similar to Mn in GaAs. For decreasing temperature, the conductivity decreases by eight orders of magnitude and follows σ ∼ exp(1/T 1/2).
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Dakhama, A., Feinstein, C. & Heiman, D. Electrical Properties and Ferromagnetism in (Ga,Cr)As. Journal of Superconductivity 16, 59–62 (2003). https://doi.org/10.1023/A:1023276416177
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DOI: https://doi.org/10.1023/A:1023276416177