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Enhancement of spin stiffness with dilution in a ferromagnetic Kondo lattice model
Subrat Kumar Das, Avinash Singh
Carrier-induced ferromagnetism is investigated in a diluted ferromagnetic Kondo lattice model for several ordered impurity arrangements on square and cubic lattices, allowing for q…
Carrier-induced ferromagnetism in a diluted Hubbard model
Sudhakar Pandey, Avinash Singh
Carrier-induced ferromagnetism is investigated in a diluted Hubbard model for ordered impurity arrangements. The delicate competition between particle-hole processes contributing t…
Spin clustering and ferromagnetic couplings in a dilute magnetic semiconductor
Avinash Singh
Ferromagnetic couplings in spin clusters are shown to be strongly enhanced compared to those for an ordered impurity arrangement, even for the same spin separation and hole doping.…
Spin fluctuations in a metallic antiferromagnet
Avinash Singh
The magnon energy and amplitude renormalization due to intraband particle-hole excitations are studied in a metallic antiferromagnet. The change in sign of the intraband contributi…
Magnetic phase diagram of the half-filled t-t'-Hubbard model -- finite-U effects on competing interactions and frustration
Avinash Singh
The magnon propagator is evaluated in the AF (π,π,π) and the F-AF (0,π,π) states at the RPA level, and the spin-fluctuation corrections are compared. Transverse spin fluctuations a…
Spectral function of transverse spin fluctuations in an antiferromagnet
Avinash Singh
The spectral function of transverse spin fluctuations, including the contributions from both the single-particle and the collective (magnon) excitations in an antiferromagnet, is e…