ar X iv : c on d - m at / 9 50 50 09 v 2 5 M ay 1 99 5 Magnetic Transition Temperature of ( La , Sr ) MnO 3
نویسنده
چکیده
Using the Kondo lattice model with classical spins in infinite dimension, magnetic phase transition in the perovskite-type 3d transition-metal oxide La1−xSrxMnO3 is theoretically studied. On the Bethe lattice, the self-consistency equations are solved exactly. Curie temperatures at the region of double-exchange ferromagnetism 0.1 <∼ x <∼ 0.25 as well as the Nèel temperature at x = 0 are well reproduced quantitatively. Pressure effect on the Curie temperature is also discussed.
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ar X iv : c on d - m at / 9 50 51 17 v 1 2 5 M ay 1 99 5 Temperature Dependence of the Conductivity in ( La , Sr ) MnO 3
Using the Kondo lattice model with classical spins in infinite dimension, conductivity in the perovskite-type 3d transition-metal oxide (La,Sr)MnO3 is theoretically studied. Green’s functions as well as spontaneous magnetization are obtained exactly on the Bethe lattice as a function of temperature. Conductivity is calculated from the Kubo formula. Below the Curie temperature, resistivity as a ...
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