Electrical properties and ferromagnetism in (Ga,Cr)As

被引：3
作者：
Dakhama, A [1 ]
Feinstein, C [1 ]
Heiman, D [1 ]
机构：
[1] Northeastern Univ, Dept Phys, Boston, MA 02115 USA
来源：
JOURNAL OF SUPERCONDUCTIVITY | 2003年 / 16卷 / 01期
基金：
美国国家科学基金会;
关键词：
ferromagnetic semiconductors; GaAs; (Ga; Cr)As; magnetic polarons; Coulomb gap;
D O I：
10.1023/A:1023276416177
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
MBE-grown (Ga, Cr) As has interesting electric and magnetic properties. Ga1-xCrxAs 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 similar to10(20) 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 sigma similar to exp(1/T-1/2).
引用
收藏
页码：59 / 62
页数：4
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