Hydrostatic pressure effect in La1-xCaxMnO3

The pressure effect is studied for the doped compound La1-xCaxMnO3 (x = 1/3 ) using the first-principles spin-polarized discrete variational method, in the framework of density functional theory with local density approximatio n. The pressure dependence of both effective electron hopping integral (t) over tilde and Hund's coupling strength J(H) is investigated systematically , which is essential to explain the qualitative relations between the press ure and properties such as colossal magnetoresistance and the Curie tempera ture T-c of this material. (C) 1999 American Institute of Physics. [S0021-8 979(99)20208-3].