Role of the E-2g phonon in the superconductivity of MgB2: a Raman scattering study

dc.creatorMartinho, H
dc.creatorRettori, C
dc.creatorPagliuso, PG
dc.creatorMartin, AA
dc.creatorMoreno, NO
dc.creatorSarrao, JL
dc.date2003
dc.date2014-11-14T11:11:56Z
dc.date2015-11-26T16:06:19Z
dc.date2014-11-14T11:11:56Z
dc.date2015-11-26T16:06:19Z
dc.date.accessioned2018-03-28T22:55:09Z
dc.date.available2018-03-28T22:55:09Z
dc.identifierSolid State Communications. Pergamon-elsevier Science Ltd, v. 125, n. 9, n. 499, n. 502, 2003.
dc.identifier0038-1098
dc.identifierWOS:000181213000009
dc.identifier10.1016/S0038-1098(02)00877-3
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/75728
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/75728
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/75728
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1265888
dc.descriptionTemperature-dependent Raman scattering studies in polycrystalline MgB2 (10 < T < 300 K) reveal that the E-2g phonon does not experience any self-energy renormalization effect across the superconducting critical temperature T-C approximate to 39 K, in contrast with most of the current theoretical models. In the presence of our results, those models must be reviewed. The analysis of the temperature dependence of the E-2g phonon frequency yields an isobaric Gruneisen parameter of \gamma(E2g)\ less than or equal to 1, smaller than the value of 3.9 obtained from isothermal Raman experiments under pressure. It is suggested that this apparent disagreement can be explained in terms of pressure-induced changes of the topology of the Fermi surface. (C) 2003 Elsevier Science Ltd. All rights reserved.
dc.description125
dc.description9
dc.description499
dc.description502
dc.languageen
dc.publisherPergamon-elsevier Science Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationSolid State Communications
dc.relationSolid State Commun.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectsuperconductors
dc.subjectphonons
dc.subjectinelastic light scattering
dc.subjectTemperature-dependence
dc.subjectSingle-crystals
dc.subjectHigh-pressure
dc.subjectGap
dc.subjectTransition
dc.subjectIntensity
dc.subjectAnomalies
dc.subjectState
dc.subjectBoron
dc.titleRole of the E-2g phonon in the superconductivity of MgB2: a Raman scattering study
dc.typeArtículos de revistas


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