Ferromagnetism in Ga1-xMnxP:: Evidence for inter-Mn exchange mediated by localized holes within a detached impurity band -: art. no. 207204

被引：90

作者：

Scarpulla, MA

Cardozo, BL

Farshchi, R

Oo, WMH

McCluskey, MD

Yu, KM

Dubon, OD ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[3] Washington State Univ, Dept Phys, Pullman, WA 99164 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.95.207204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report an energy gap for hole photoexcitation in ferromagnetic Ga(1-x)Mn(x)P that is tunable by Mn concentration (x <= 0.06) and by compensation with Te donors. For x similar to 0.06, electrical transport is dominated by excitation across this gap above the Curie temperature (T(C)) of 60 K and by thermally activated hopping below T(C). Magnetization measurements reveal a moment of 3.9 +/- 0.4 mu(B) per substitutional Mn while the large anomalous Hall signal demonstrates that the ferromagnetism is carrier mediated. In aggregate these data indicate that ferromagnetic exchange is mediated by holes localized in a Mn-derived band that is detached from the valence band.

引用

页数：4

共 30 条

[11] Surface effects in Mn L3,2 x-ray absorption spectra from (Ga,Mn)As [J].