Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2

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dc.creatorKrellner, C.
dc.creatorHartmann, S.
dc.creatorPikul, A.
dc.creatorOeschler, N.
dc.creatorDonath, J. G.
dc.creatorGeibel, C.
dc.creatorSteglich, F.
dc.creatorWosnitza, J.
dc.date2009-04-20
dc.date.accessioned2026-07-07T13:14:21Z
dc.date.available2026-07-07T13:14:21Z
dc.descriptionWe report on precise low-temperature specific-heat measurements, C(T), of YbRh2Si2 in the vicinity of the antiferromagnetic phase transition on a single crystal of superior quality (RRR 150). We observe a very sharp peak at T_N=72mK with absolute values as high as C/T=8J/molK^2. A detailed analysis of the critical exponent αaround T_N reveals α=0.38 which differs significantly from those of the conventional universality classes in the Ginzburg-Landau theory, where α<0.11. Thermal-expansion measurements corroborate this large positive critical exponent. These results provide insight into the nature of the critical magnetic fluctuations at a temperature-driven phase transition close to a quantum critical point.
dc.descriptionAccepted for PRL
dc.identifierhttps://arxiv.org/abs/0904.2969
dc.identifierhttp://arxiv.org/abs/0904.2969
dc.identifierPhys. Rev. Lett. 102, 196402 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.196402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230184
dc.subjectStrongly Correlated Electrons
dc.titleViolation of critical universality at the antiferromagnetic phase transition of YbRh2Si2
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