Colossal Magnetoresistance of Ferromagnetic Manganites: Structural Tuning and Mechanisms

J. Fontcuberta, B. Martínez, A. Seffar, S. Piñol, J. L. García-Muñoz, and X. Obradors
Phys. Rev. Lett. 76, 1122 – Published 12 February 1996
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Abstract

The amplitude Δρ(T,H)/ρ and temperature TM, where the colossal magnetoresistance (CMR) response of L1xCaxMnO3 manganites are maximum, are found to be controlled by the radius of the lanthanide (L3+) which modifies the bending of the Mn-O-Mn bond. Increasing the bond distortion lowers TM and enhances Δρ(T,H)/ρ. Enhanced CMR arises from (1) a shift to lower temperatures of TM, (2) a reduced mobility of the doping holes, and (3) an increase of the coupling between itinerant and localized electrons. The resistivity ρH follows an BM2H law and the parameter B is also tuned by the Mn-O-Mn bond angle. The narrowing of the electronic bandwidth is the fundamental parameter controlling the observed CMR.

  • Received 19 June 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.1122

©1996 American Physical Society

Authors & Affiliations

J. Fontcuberta, B. Martínez, A. Seffar, S. Piñol, J. L. García-Muñoz, and X. Obradors

  • Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Científicas, Campus Universitat Autònoma de Barcelona, Bellaterra 08193, Catalunya, Spain

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Vol. 76, Iss. 7 — 12 February 1996

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