Distant-neighbor exchange constants in dilute magnetic semiconductors

被引:25
作者
Bindilatti, V
ter Haar, E
Oliveira, NF
Shapira, Y
Liu, MT
机构
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil
[2] Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA
关键词
D O I
10.1103/PhysRevLett.80.5425
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Several exchange constants J(i) between Mn2+ ions which are not nearest neighbors were determined in Zn1-xMnxX (X = S, Se, Te) from magnetization steps at 20 mK. When the J(i)'s are listed in order of decreasing size, ratios between successive J(i)'s are material dependent, and differ from all predictions. The measured J(i)'s were identified by comparing the magnetization curves with simulations which assumed a random Mn distribution. Contrary to existing theories the second-largest exchange constant is not J(2) between next-nearest neighbors. The most likely alternative is J(4), between fourth neighbors.
引用
收藏
页码:5425 / 5428
页数:4
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