Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/281
Type: Artigo de periódico
Title: Polaron liquid-gas crossover at the orthorhombic-rhombohedral transition of manganites
Author: SOUZA, J. A.
TERASHITA, H.
GRANADO, E.
JARDIM, R. F.
OLIVEIRA JR., N. F.
MUCCILLO, R.
Abstract: High-resolution synchrotron x-ray powder diffraction in La(0.7)Ca(0.3)MnO(3) shows in detail a first-order structural phase transition from orthorhombic (space-group Pnma) to rhombohedral (space-group R (3) over barc) crystal structures near T(S)=710 K. Magnetic susceptibility measurements show that the rhombohedral phase strictly obeys the Curie-Weiss law as opposed to the orthorhombic phase. A concomitant change in the electrical resistivity behavior, consistent with an alteration from nonadiabatic to adiabatic small polaron hopping regimes, was also observed at T(S). The simultaneous change in transport and magnetic properties are identified as a transition from a correlated polaron liquid for T<T(S) to an uncorrelated polaron gas for T>T(S), driven by the change in the crystal symmetry.
Country: Estados Unidos
Editor: AMER PHYSICAL SOC
Citation: PHYSICAL REVIEW B, v.78, n.5, 2008
Rights: fechado
Identifier DOI: 10.1103/PhysRevB.78.054411
Address: http://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&UT=000259368200067&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord
http://dx.doi.org/10.1103/PhysRevB.78.054411
Date Issue: 2008
Appears in Collections:IFGW - Artigos e Materiais de Revistas Científicas

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