11 citations · 17 across the 4 of their papers we have counts for
4 papers
Phase diagrams of in Double Exchange Model with added antiferromagnetic and Jahn-Teller interaction
Vasil Michev, Naoum Karchev
The phase diagram of the multivalent manganites , in space of temperature and doping , is a challenge for the theoretical physics. It is an important test…
Ferromagnetic phases in spin-Fermion systems
N. Karchev
Spin-Fermion systems which obtain their magnetic properties from a system of localized magnetic moments being coupled to conducting electrons are considered. The dynamical degrees…
Magnon-Mediated Superconductivity in Itinerant Ferromagnets
N. Karchev
The present paper discusses magnon-mediated superconductivity in ferromagnetic metals. The mechanism explains in a natural way the fact that the superconductivity in UGe_2, ZrZn_2…
Generalized CP^1 model from t_1-t_2-J model
Naoum Karchev
A long-wavelength, low-frequency effective theory is obtained from model. The action is written in terms of two-component bose spinor fields (CP^1 fields) and two spinl…