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Journal ArticleDOI

Transport properties and magnetic behavior of La1−xSrxMnO3 single crystals (abstract)

01 Apr 1996-Journal of Applied Physics (American Institute of Physics)-Vol. 79, Iss: 8, pp 4554-4554
TL;DR: In this article, a cusp in the magnetoresistance (MR) was observed near T c for the crystals with x≥0.13 and 0.15, respectively.
Abstract: Single crystals of La1−x Sr x MnO3 with x ranging from 0.06 to 0.42 have been investigated by various techniques: resistivity and magnetoresistance,superconducting quantum interference device magnetometry, and 55Mn nuclear magnetic resonance. In addition, for two Sr concentrations, x=0.13 and 0.25, the I(V) characteristic of the oxide‐metal junction has been measured versus temperature. Semiconductor‐metal transition occurring just below the Curie temperatureT c was observed for x≥0.175 whereas, for x≤0.15, the crystals exhibits only semiconducting behavior, in agreement in the previous studies. These transport properties are closely connected with the electron transfer mediated by the double exchange interaction between Mn3+ and Mn4+, as revealed by 55Mn spin‐echo experiments. A cusp in the magnetoresistance(MR) was observed near T c for the crystals with x≥0.13 with typical maximum resistivity ratio R(0)/R(10 T)≊10; for the sample with x=0.1, the huge MR persists well below T c ≊140 K, which is probably due to a noncollinear spin configuration. The I(V) characteristic of the oxide‐aluminum junction is strongly dependent on temperature and applied magnetic field. In the semiconducting phase, a nonlinear behavior reminiscent to that of a strongly doped dirty semiconductor is observed.
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TL;DR: In this paper, the authors show that the resistivity changes with the magnitude of temperature or field-induced magnetization in a single crystal of La 1-x Sr x MnO 3 near the critical composition (x ≈ 0.17).
Abstract: Giant magnetotransport phenomena including the field-induced nonmetal-metal transition have been found in single crystals of La 1- x Sr x MnO 3 near the critical composition ( x ≈0.17) for the nonmetal-metal transition and in the temperature region around the magnetic phase transition. Change of the resistivity shows a universal curve as a function of the magnitude of temperature- or field-induced magnetization, the most of which agrees with the prediction by the D =∞ and S =∞ Kondo lattice model with strong ferromagnetic (Hund) coupling.

555 citations

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