Theory of ferromagnetism in (A,Mn)B semiconductors

Details Theory of ferromagnetism in (A,Mn)B semiconductors Theory of ferromagnetism in (A,Mn)B semiconductors

2001-02-20

arxiv.org/abs/cond-mat/0102361v1

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages

Scientific paper

A brief review of theory of ferromagnetism of dilute magnetic semiconductors of the form (A,Mn)B based on the double exchange model is first given. A systematic investigation of the phenomena extending the current theory is outlined. We begin with an investigation of the regions of instability of the nonmagnetic towards the ferromagnetic state of a system of Mn-atoms doped in AB-type semiconductor. A self-consistent many-body theory of the ferromagnetic state is then developed, going beyond the mean field approaches by including fluctuations of the Mn-spins and the itinerant hole-gas. A functional theory suitable for computation of system properties such as Curie temperature as a function of hole and the Mn-concentration, spin-current, etc. is formulated.

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