4 papers · 1 filter
The Manganites as Metallic Semiconductors
Boris V. Karpenko, Alexander V. Kuznetzov
The two-band model possessing metal and semiconductor properties is offered. This model may explain the appearance of temperature maximum of the electrical resistance at the proper…
The Exchange Parameters in Lanthanum Manganites
B. V. Karpenko, A. V. Kuznetzov
The spin-wave spectrum in the metallic ferromagnetic lantha-num cubic manganites was investigated. The interactions with four coordination spheres (32 neighbors) were taken into ac…
Magnetic properties of collinear structures of compound La1-xCaxMnO3
B. V. Karpenko, L. D. Falkovskaya, A. V. Kuznetsov
With use of homogeneous model for magnetic sub-lattice of compound La1-x CaxMnO3 allowing for Heisenberg superexchange and double exchange between nearest neighbors the temperature…
Magnetic structure and double exchange in hypothetical compound La1-xCaxMnO3
B. V. Karpenko, L. D. Falkovskaya, A. V. Kuznetsov
Question about the appearance of different magnetic structures in the family of compounds La1-xCaxMnO3,is investigated theoretically. It is supposed that the whole series has GdFeO…