Bandwidth- and Doping-Dependent Pressure Effects on the Ferromagnetic Transition in Perovskite Manganites.

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  • Moritomo Yutaka
    Joint Research Center for Atom Technology (JRCAT), Tsukuba 305
  • Kuwahara Hideki
    Joint Research Center for Atom Technology (JRCAT), Tsukuba 305
  • Tokura Yoshinori
    Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 Department of Applied Physics, University of Tokyo, Tokyo 113

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  • Bandwidth-and Doping-Dependent Pressure

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Effects of hydrostatic pressure on the magnetic and transport properties of R1-xSrxMnO3 have been investigated with systematic variation of the one-electron bandwidth (W) of a conduction electron, as well as of the doping level (x).The positive pressure coefficient (dlnTC/dP) of the Curie temperature is observed for all the compounds, and its absolute value increases with decrease of W, or equivalently, TC.We have derived a nearly x-independent empirical relation between the coefficient and TC in the lightly doped region (x≤ 0.4).The coefficients at x≈1/2, however, are found to deviate from the above relation due to competing antiferromagnetic and/or charge-ordering interaction.

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