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Heat transport study of field-tuned quantum criticality in CeIrIn5

TitleHeat transport study of field-tuned quantum criticality in CeIrIn5
Publication TypeJournal Article
Year of Publication2016
AuthorsShakeripour, H, Tanatar, MA, Petrovic, C, Taillefer, L
JournalPhysical Review B
Volume93
Pagination075116
Date Published02
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000369727700003
Keywordscecoin5, critical-point, fermion compounds, metals, states, superconductivity, temperature
Abstract

0 limit obeys the Wiedemann- Franz law, kappa/T = L-0/rho, where L-0 = 2.45 x 10(-8) W Omega K-2 is the Sommerfeld value of the Lorenz number. The temperature- dependent parts of both the electrical and thermal resistivity, w equivalent to T/ L-0 kappa, follow the functional dependence expected for the Fermi liquid theory of metals with rho - rho(0) = AT(2), w - w(0) = BT2, with rho(0) = w(0) and B approximate to 2A. The coefficient B does not showa significant field dependence even upon approaching H-c2 = 0.4 T of the bulk superconducting state. The weak response to the magnetic field is in stark contrast with the behavior found in the closely related CeCoIn5, in which the field-tuned quantum critical point coincides with H-c2. The value of the electron-electron mass enhancement, as judged by the A and B coefficients, is about one order of magnitude reduced in CeIrIn5 as compared to CeCoIn5 (in spite of the fact that the zero field gamma(0) in CeIrIn5 is twice as large as gamma(0) in CeCoIn5), which suggests that the material is significantly farther away from the magnetic quantum critical point at bulk H-c2 and at all of the studied fields. A suppressed Kadowaki-Woods ratio in CeIrIn5 compared to CeCoIn5 suggests a notably more localized nature of f electrons in the compound.

DOI10.1103/PhysRevB.93.075116
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Complex States