2 research outputs found

    High-Pressure Phase Diagram in the Manganites: a Two-site Model Study

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    The pressure dependence of the Curie temperature TCT_C in manganites, recently studied over a wide pressure range, is not quantitatively accounted for by the quenching of Jahn-Teller distortions, and suggests the occurrence of a new pressure-activated localizing processes. We present a theoretical calculation of TCT_C based on a two-site double-exchange model with electron-phonon coupling interaction and direct superexchange between the t2g% t_{2g} core spins. We calculate the pressure dependence of TCT_C and compare it with the experimental phase diagram. Our results describe the experimental behavior quite well if a pressure-activated enhancement of the antiferromagnetic superexchange interaction is assumed
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