Full metadata record
DC FieldValueLanguage
dc.contributor.authorWang, J. F.en_US
dc.contributor.authorLi, D. P.en_US
dc.contributor.authorKao, H. C.en_US
dc.contributor.authorRosenstein, B.en_US
dc.date.accessioned2018-08-21T05:54:01Z-
dc.date.available2018-08-21T05:54:01Z-
dc.date.issued2017-05-01en_US
dc.identifier.issn0003-4916en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.aop.2017.03.015en_US
dc.identifier.urihttp://hdl.handle.net/11536/145487-
dc.description.abstractCondensed matter systems undergoing second order transition away from the critical fluctuation region are usually described sufficiently well by the mean field approximation. The critical fluctuation region, determined by the Ginzburg criterion, vertical bar T/T-c, 1 vertical bar << Gi, is narrow even in high T, superconductors and has universal features well captured by the renormalization group method. However recent experiments on magnetization, conductivity and Nernst effect suggest that fluctuations effects are large in a wider region both above and below T-c. In particular some "pseudogap" phenomena and strong renormalization of the mean field critical temperature T-mf can be interpreted as strong fluctuations effects that are nonperturbative (cannot be accounted for by "gaussian fluctuations"). The physics in a broader region therefore requires more accurate approach. Self consistent methods are generally "non-conserving" in the sense that the Ward identities are not obeyed. This is especially detrimental in the symmetry broken phase where, for example, Goldstone bosons become massive. Covariant gaussian approximation remedies these problems. The Green's functions obey all the Ward identities and describe the fluctuations much better. The results for the order parameter correlator and magnetic penetration depth of the Ginzburg-Landau model of superconductivity are compared with both Monte Carlo simulations and experiments in high T-c, cuprates. (C) 2017 Elsevier Inc. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectCovariant gaussian approximationen_US
dc.subjectGinzburg-Landauen_US
dc.subjectWard identityen_US
dc.subjectSuperconducting thermal fluctuationsen_US
dc.subjectMagnetic penetration depthen_US
dc.titleCovariant gaussian approximation in Ginzburg-Landau modelen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.aop.2017.03.015en_US
dc.identifier.journalANNALS OF PHYSICSen_US
dc.citation.volume380en_US
dc.citation.spage228en_US
dc.citation.epage254en_US
dc.contributor.department電子物理學系zh_TW
dc.contributor.departmentDepartment of Electrophysicsen_US
dc.identifier.wosnumberWOS:000401049500018en_US
Appears in Collections:Articles