A universal relationship between magnetization and the local structure in La1−xCaxMnO3; a probe of the magnetization process

L Downward; F Bridges; S Bushart; J Neumeier; L Zhou

doi:10.1238/Physica.Topical.115a00629

Physica Scripta

A universal relationship between magnetization and the local structure in La_1−xCa_xMnO₃; a probe of the magnetization process

L Downward¹, F Bridges¹, S Bushart¹, J Neumeier² and L Zhou³

Published under licence by IOP Publishing Ltd
Physica Scripta, Volume 2005, Number T115 Citation L Downward et al 2005 Phys. Scr. 2005 629 DOI 10.1238/Physica.Topical.115a00629

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Author affiliations

¹ Department of Physics, University of California, Santa Cruz, CA 95064, USA

² Department of Physics, Montana State University, Bozeman, MT 59717, USA

³ Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, Menlo Park, CA 94025, USA

Dates

Received 26 June 2003
Accepted 4 November 2003

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Abstract

We report X-ray Absorption Fine Structure (XAFS) measurements of the colossal magneto-resistance (CMR) samples La_0.79Ca_0.21MnO₃ and La_0.7Ca_0.3MnO₃ at high magnetic fields. For T near T_c, the width parameter of the pair distribution function, σ, decreases significantly as the applied magnetic field is increased. For a given magnetization, M, the decrease in σ² from the disordered polaron state is the same, irrespective of whether M was achieved through a change in temperature or the application of an external magnetic field. This universal behavior can be modeled as a quadratic function of magnetization, and suggests a new model for the magnetization process.

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