Simultaneous observation of the magnetic and electric behavior in a correlated system near a metal-semiconductor transition: ESR in pellets of conducting polymers

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorKondo, J. M.
dc.creatorWalmsley, L.
dc.creatorRettori, C.
dc.creatorSercheli, M. S.
dc.creatorCorrea, A. A.
dc.creatorPereira, E. C.
dc.date2013-09-30T18:51:00Z
dc.date2014-05-20T14:16:42Z
dc.date2016-10-25T17:39:37Z
dc.date2013-09-30T18:51:00Z
dc.date2014-05-20T14:16:42Z
dc.date2016-10-25T17:39:37Z
dc.date2009-07-01
dc.date.accessioned2017-04-05T22:22:40Z
dc.date.available2017-04-05T22:22:40Z
dc.identifierPhysical Review B. College Pk: Amer Physical Soc, v. 80, n. 1, p. 6, 2009.
dc.identifier1098-0121
dc.identifierhttp://hdl.handle.net/11449/25023
dc.identifierhttp://acervodigital.unesp.br/handle/11449/25023
dc.identifier10.1103/PhysRevB.80.014410
dc.identifierWOS:000268617100065
dc.identifierWOS000268617100065.pdf
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.80.014410
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/869963
dc.descriptionElectron spin resonance (ESR) experiments show, at the metal-semiconductor transition temperature of a conducting polymer, the distinct contributions of the disordered and crystalline regions. In the more disordered regions of the polymer the polarons experience an antiferromagnetic coupling. As the level of disorder decreases, when small crystalline regions appear, there is a tendency, in some temperature range, for the polarons to interact ferromagnetically. For more ordered regions or crystalline regions of larger sizes, there is a competition between localized ferromagnetic coupled polarons and delocalized ones, that is, between localization and delocalization. The possibility to fit the ESR data for one of the samples using two Dysonian lines, one for each phase, allows one to follow the general behavior of the microwave conductivity as a function of the temperature. The semiconducting behavior of the disordered phase is clearly observed, as well as the true metallic behavior of the crystalline phase revealed by the increase in conductivity with the decrease in temperature.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageeng
dc.publisherAmer Physical Soc
dc.relationPhysical Review B
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectantiferromagnetic materials
dc.subjectconducting polymers
dc.subjectelectrical conductivity transitions
dc.subjectferromagnetic materials
dc.subjectparamagnetic resonance
dc.subjectpolarons
dc.titleSimultaneous observation of the magnetic and electric behavior in a correlated system near a metal-semiconductor transition: ESR in pellets of conducting polymers
dc.typeOtro


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