IngentaConnect Magnetoresistance and magnetic susceptibility of phase-separated ...

Authors: Babushkina N.A.¹; Chistotina E.A.¹; Kugel K.I.²; Rakhmanov A.L.²; Gorbenko O.Y.³; Kaul A.R.³

Source: Journal of Physics: Condensed Matter, Volume 15, Number 2, 2003 , pp. 259-266(8)

Publisher: Institute of Physics Publishing

Abstract:

Electrical resistivity, magnetoresistance and magnetic susceptibility were measured for ceramic (La_1-yPr_y)_0.7Ca_0.3MnO₃samples (y 0.75 and 1) with different content of ¹⁸O isotope. All samples were paramagnetic insulators in the high-temperature range. Some of them became ferromagnetic (FM) metals at temperatures below 60-80 K. The high-temperature behaviour of the resistivity, magnetoresistance and magnetic susceptibility was practically identical for all samples in spite of the significant difference in their low-temperature properties. In particular, the magnetoresistance was proportional to the magnetic field squared and decreased approximately as 1/T⁵in a wide magnetic field and temperature range. The results were interpreted based on the concept of an inhomogeneous state with pronounced FM correlations in the paramagnetic phase.

Language: English

Document Type: Miscellaneous

Affiliations: 1: Institute of Molecular Physics, Russian Research Center 'Kurchatov Institute', Kurchatov Sqr. 1, Moscow 123182, Russia 2: Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Izhorskaya Str. 13/19, Moscow 125412, Russia 3: Department of Chemistry, Moscow State University, Vorobievy Gory, Moscow 119992, Russia

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Magnetoresistance and magnetic susceptibility of phase-separated La-Pr-Ca manganites