Absence of small lattice polarons above the Curie temperature in magnetoresistive manganites

Vladimir Chechersky; Amar Nath; I. Isaac; Jurgen P. Franck; Kartik Ghosh; Richard L. Greene

doi:10.1103/PhysRevB.63.052411

Abstract

It is generally believed that the electrical transport in magnetoresistive manganites above $T_{C}$ is governed by small polarons associated with large lattice distortions. We present evidence which confirms the existence of magnetic clusters (polarons) associated with minimal lattice distortions above the Curie temperature. We take advantage of the fact that the Mössbauer spectra of the relatively large and slowly fluctuating magnetic polarons consist of incompletely collapsed magnetic component with extensive wings.

Received 30 August 2000

DOI:https://doi.org/10.1103/PhysRevB.63.052411

Authors & Affiliations

Vladimir Chechersky and Amar Nath^*

Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104-2875

I. Isaac^† and Jurgen P. Franck

Department of Physics, University of Alberta, Edmonton, AB, T6G2J1, Canada

Kartik Ghosh^‡ and Richard L. Greene

Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111

^*Author to whom correspondence may be addressed. Electronic mail: amar.nath@drexel.edu
^†Present address: Department of Electrical Engineering, Ohsaki Laboratory, University of Tokyo, Tokyo 113, Japan.
^‡Present address: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845.

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Physical Review B

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