Ground-state properties and the molecular theory of the Curie temperature in the coherent potential approximation of diluted magnetic semiconductors
Ground-state properties and the molecular theory of the Curie temperature in the coherent potential approximation of diluted magnetic semiconductors
复制标题
稀磁半导体相干势近似中的基态性质和居里温度的分子理论
DOI:
10.1088/0953-8984/18/4/027
复制
发表时间:
2005
期刊:
影响因子:
--
通讯作者:
M. Mochena
中科院分区:
文献类型:
--
作者:
S. feng;M. Mochena
Using a spin-1/2 description of valence holes and Kondo coupling between local spins and carriers, GaAs-based III–V diluted magnetic semiconductors (DMS) are studied in the coherent potential approximation (CPA). Our calculated relation between ground-state energy and impurity magnetization shows that ferromagnetism is always favourable at low temperatures. For very weak Kondo coupling, the density of states (DOS) of the host semiconductor is not modified much. Impurity bands can be generated at the bottom of the host band only when Kondo coupling is strong enough. Using Weiss molecular theory, we predict a linear relation of Curie temperature with respect to Kondo coupling and doping concentration x if the hole density is proportional to x.
DOI:
--
发表时间:
2003
期刊:
SOLID STATE PHYSICS (KOTAI BUTSURI) Vol.38 no.10
影响因子:
--
作者:
Masao Takahashi;Kenn Kubo (in Japanese)
通讯作者:
Kenn Kubo (in Japanese)
DOI:
--
发表时间:
2004
期刊:
Phys.Rev.B 70
影响因子:
--
作者:
Y.H.Matsuda;J.Kono;Y.Sun;C.J.Stanton;N.Miura;S.Ikeda;Y.Hashimoto;S.Katsumoto;H.Munekata
通讯作者:
H.Munekata