Insulator-metal transition and giant magnetoresistance in La1xSrxMnO3

A. Urushibara, Y. Moritomo, T. Arima, A. Asamitsu, G. Kido, and Y. Tokura
Phys. Rev. B 51, 14103 – Published 15 May 1995
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Abstract

Insulator-metal phenomena depending on band filling (doping degree), temperature, and external magnetic field have been investigated for prototypical double-exchange ferromagnets, namely, crystals of La1xSrxMnO3 (0≤x≤0.6). The electronic phase diagram in the plane of the temperature vs nominal hole concentration (x) has been deduced from the magnetic and electrical measurements on the melt-grown crystals. Around the ferromagnetic transition temperature TC, large negative magnetoresistance was observed. Irrespective of temperature, reduction of the resistivity is scaled with the field-induced magnetization (M) as -Δρ/ρ=C(M/Ms)2 for M/Ms≲0.3, where Ms is the saturated magnetization. The coefficient C strongly depends on x, i.e., C≊4 near the compositional insulator-metal phase boundary (xc∼0.17), but decreases down to ≊1 for x>=0.4, indicating the critical change of the electronic state.

  • Received 20 January 1995

DOI:https://doi.org/10.1103/PhysRevB.51.14103

©1995 American Physical Society

Authors & Affiliations

A. Urushibara

  • Department of Physics, University of Tokyo, Tokyo 113, Japan

Y. Moritomo

  • Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan

T. Arima

  • Department of Physics, University of Tokyo, Tokyo 113, Japan

A. Asamitsu

  • Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan

G. Kido

  • National Research Institute for Metals, Tsukuba 305, Japan

Y. Tokura

  • Department of Physics, University of Tokyo, Tokyo 113, Japan
  • Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan

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Issue

Vol. 51, Iss. 20 — 15 May 1995

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