Effect of pressure and magnetic field on the resistance of the self-doped manganese perovskite La0.91Mn0.95O3

V. Markovich, E. Rozenberg, G. Gorodetsky, B. Revzin, J. Pelleg, I. Felner

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Abstract

The effect of hydrostatic pressure P up to 9 kbar and applied magnetic fields H up to 15 kOe on the transport properties of La0.91Mn0.95O3 at temperatures T = 77 - 300 K is reported. At ambient pressure and zero magnetic field the transition to a ferromagnetic phase takes place at Tc≅252 K whereas a maximum in resistivity p is observed at Tr = 262 K. It is shown that the maximum in the derivative dρ(T, P)/dT occurs at the ferromagnetic transition temperature Tc. The observed pressure coefficient d In Tc/dP≅0.0048 kbar-1 is found to be consistent with Mn+4 concentration of about 40%. The observed behavior of the resistivity ρ(T) at applied magnetic field is analyzed by the mean field theory. It is shown that the maximum of dρ(T)/dT at applied magnetic field H shifts according to H2/3.

Original languageEnglish
Pages (from-to)14186-14190
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number21
DOIs
StatePublished - 1 Dec 2000

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