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Wiedemann-Franz law and nonvanishing temperature scale across the field-tuned quantum critical point of YbRh2Si2

TitleWiedemann-Franz law and nonvanishing temperature scale across the field-tuned quantum critical point of YbRh2Si2
Publication TypeJournal Article
Year of Publication2014
AuthorsReid, JP, Tanatar, MA, Daou, R, Hu, RW, Petrovic, C, Taillefer, L
JournalPhysical Review B
Volume89
Pagination045130
Date Published01
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000332233900003
Keywordsmetals, phase-transition, superconductivity
Abstract

0. We propose that T-star marks the onset of short-range magnetic correlations, persisting beyond H-c. By comparing samples of different purity, we conclude that the Wiedemann-Franz law holds in YbRh2Si2, even at H-c, implying that no fundamental breakdown of quasiparticle behavior occurs in this material. The overall phenomenology of heat and charge transport in YbRh2Si2 is similar to that observed in the heavy-fermion metal CeCoIn5, near its own field-tuned quantum critical point.

DOI10.1103/PhysRevB.89.045130
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Nanoscale and Ultrafast