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Critical dynamics at incommensurate phase transitions and NMR relaxation experiments

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dc.contributor.authorKaufmann, B. A.en
dc.contributor.authorSchwabl, Franzen
dc.contributor.authorTäuber, Uwe C.en
dc.contributor.departmentPhysicsen
dc.date.accessioned2016-09-30T00:28:36Zen
dc.date.available2016-09-30T00:28:36Zen
dc.date.issued1999-05-01en
dc.description.abstractWe study the critical dynamics of crystals which undergo a second-order phase transition from a high-temperature normal phase to a structurally incommensurate (IC) modulated phase. We give a comprehensive description of the critical dynamics of such systems, e.g. valid for crystals of the A2BX4 family. Using an extended renormalization scheme, we present a framework in which we analyze the phases above and below the critical temperature TI . Above TI , the crossover from the critical behavior to the mean-field regime is studied. Specifically, the resulting width of the critical region is investigated. In the IC modulated phase, we consider explicitly the coupling of the order parameter modes to one-loop order. Here the Goldstone anomalies and their effect on measurable quantities are investigated. We show their relation with the postulated phason gap. While the theory can be applied to a variety of experiments, we concentrate on quadrupole-perturbed nuclear magnetic resonance (NMR) experiments. We find excellent agreement with these dynamical measurements and provide answers for some questions that arose from recent results.en
dc.description.versionPublished versionen
dc.format.extent11226 - 11243 (18) page(s)en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.59.11226en
dc.identifier.issn1098-0121en
dc.identifier.issue17en
dc.identifier.urihttp://hdl.handle.net/10919/73091en
dc.identifier.volume59en
dc.languageEnglishen
dc.publisherAmerican Physical Societyen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000084631900033&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPhysics, Condensed Matteren
dc.subjectPhysicsen
dc.subjectSPIN-LATTICE RELAXATIONen
dc.subjectQUADRUPOLAR PERTURBED NMRen
dc.subjectMINIMAL RENORMALIZATIONen
dc.subjectEPSILON-EXPANSIONen
dc.subjectCRITICAL-BEHAVIORen
dc.subjectGOLDSTONE MODESen
dc.subjectSYSTEMSen
dc.subjectCOEXISTENCEen
dc.subjectFERROMAGNETSen
dc.subjectATTENUATIONen
dc.titleCritical dynamics at incommensurate phase transitions and NMR relaxation experimentsen
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/Physicsen

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