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Ferromagnetism of GaMnAs and Weiss theory of Curie temperature in the coherent potential approximation
Sze-Shiang Feng, Mogus Mochena
The zinc-blende GaAs-based III-V diluted magnetic semiconductors (DMS)are studied in the coherent potential approximation(CPA). In this work, we use the exact Hilbert transformatio…
A low temperature derivation of spin-spin exchange in Kondo lattice model
Sze-Shiang Feng, Mogus Mochena
Using Hubbard-Stratonovich transformation and drone-fermion representations for spin-1/2 and for spin-3/2, which is presented for the first time, we make a path-integral formulatio…
Ground-state properties and molecular theory of Curie temperature in the coherent potential approximation of diluted magnetic semiconductors
Sze-Shiang Feng, Mogus Mochena
Using 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 p…
Spin-wave softening and Hund's coupling in ferromagnetic manganites
Sze-Shiang Feng, Mogus Mochena
Using one-orbital model of hole-doped manganites, we show with the help of Holstein-Primakov transformation that finite Hund's coupling is responsible for the spin-wave softening i…