19 citations · 41 across the 8 of their papers we have counts for
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Towards the theory of ferrimagnetism II
Naoum Karchev
The present paper is a sequel to the paper by Karchev (2008 J.Phys.:Condens.Matter {\bf 20} 325219). A two-sublattice ferrimagnet, with spin- operators at the su…
Ferrimagnetism of MnV_2O_4 spinel
Naoum Karchev
The spinel MnV_2O_4 is a two-sublattice ferrimagnet, with site A occupied by the Mn^{2+} ion and site B by the V^{3+} ion. The magnon of the system, the transversal fluctuation of…
Towards the theory of ferrimagnetism
N. Karchev
Two-sublattice ferrimagnet, with spin- operators at the sublattice site and spin- operators at the sublattice site, is considered. The…
Two Ferromagnetic Phases in Spin-Fermion Systems
Naoum Karchev
We consider spin-fermion systems which get their magnetic properties from a system of localized magnetic moments being coupled to conducting electrons. The dynamical degrees of fre…
Curie temperature of the two band double exchange model for manganites
Vasil Michev, Naoum Karchev
We consider two-band double exchange model and calculate the critical temperature in ferromagnetic regime (Curie temperature). The localized spins are represented in terms of the S…
Itinerant Ferromagnetism and Superconductivity
Naoum Karchev
Superconductivity has again become a challenge following the discovery of unconventional superconductivity. Resistance-free currents have been observed in heavy-fermion materials,…