Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5496607 | Physics Letters A | 2017 | 5 Pages |
Abstract
In this paper, we elucidate the mechanism for Li co-dopant induced enhancement of the ferromagnetism in 2Ã2Ã2 and 3Ã3Ã3 cubic (Zn, Mn)Se using density functional calculations. The doping atoms tend to congregate together according to the ferromagnetic (FM) energy. All configurations are strongly FM ones due to double exchange (DE) and p-d exchange (PE). DE and PE are shown in the partial density of states. The hole is uniformly distributed in the cubic (Zn, Mn, Li)Se, and it is the one and only parameter to decide the exchange energy, when impurity atoms stay further away from each other. The average exchange energy of these configurations is considered to be a function of the square root of the hole concentration. The fitting data to a polynomial function shows that DE and PE have roles of similar importance in the exchange energy.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Physics and Astronomy (General)
Authors
Y. Zhu, T. Liu, X.Y. Zhang, Y.F. Pan, X.Y. Wei, C.L. Ma, D.N. Shi, J.Y. Fan,