A Functional Theory of Interacting Local Spins, Spin Polarized Electrons, and Ions: Half Metallic Magnets
Magnetism of manganites such as (La,Ba)MnO3 has a long history going back to 1950, with the discovery of ferromagnetism and metallic conduction upon doping . Zener  proposed to explain these phenomena in terms of a “double exchange” mechanism. This spawned several important developments [3,4,5] leading to new implications of this model. Most recently, the observation of colossal magnetoresistance (CMR) effects [6,7] in these systems has rekindled interest in studying the detailed interplay of magnetism, electronic transport, and structure in these materials. Electronic structure calculations on these systems have been performed  and theoretical investigations using modern techniques [9,10,11] have shown the need for self-consistent coupled fields of electrons, localized spins, and ions in this system. In this paper, we offer a functional theory of this type.
KeywordsDensity Matrix Green Function Localize Spin Spin Polarize Electron Itinerant Electron
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- 12.E.K.U. Gross, J.F. Dobson, and M. Petersilka, in Density Functional Theory II, edited by R.F. Nalewajski, Springer Series Topics in Current Chemistry (Springer, New York, 1996). This is a comprehensive review of the density-functional theory of time-dependent phenomena.Google Scholar
- 13.A.K. Rajagopal and F. Buot, in Density Functional Theory II, edited by R.F. Nalewajski, Springer Series Topics in Current Chemistry (Springer, New York, 1996). This is a comprehensive report on the functional theory of coupled fields of electrons, ions, and electromagnetic fields. The theory given in the present paper is another application of the techniques presented in this review article.Google Scholar