Mesoscopic thermodynamics of an inhomogeneous colossal-magnetoresistive phase

Equilibrium conductivity fluctuations of mesoscopic domains are found in film and bulk single-crystal manganite colossal magnetoresistive material. Temperature and field dependences of the Boltzmann factors for a collection of two-state fluctuators give measures of the magnetic moment and entropy di...

Full description

Saved in:
Bibliographic Details
Published inPhysical review letters Vol. 84; no. 15; p. 3442
Main Authors Merithew, RD, Weissman, MB, Hess, FM, Spradling, P, Nowak, ER, O'Donnell, J, Eckstein, JN, Tokura, Y, Tomioka, Y
Format Journal Article
LanguageEnglish
Published United States 10.04.2000
Online AccessGet more information

Cover

More Information
Summary:Equilibrium conductivity fluctuations of mesoscopic domains are found in film and bulk single-crystal manganite colossal magnetoresistive material. Temperature and field dependences of the Boltzmann factors for a collection of two-state fluctuators give measures of the magnetic moment and entropy differences between the states, and of the fluctuator volumes. The large resistance step size implies dramatic current inhomogeneities. Occasional anomalous temperature dependences indicate that the film inhomogeneous phase is stabilized by a repulsive interaction between conducting regions.
ISSN:1079-7114
DOI:10.1103/physrevlett.84.3442