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We report on precise low-temperature specific-heat measurements, C(T), ofYbRh2Si2 in the vicinity of the antiferromagnetic phase transition on a singlecrystal of superior quality (RRR 150). We observe a very sharp peak at T_N=72mKwith absolute values as high as C/T=8J/molK^2. A detailed analysis of thecritical exponent \alpha around T_N reveals \alpha=0.38 which differssignificantly from those of the conventional universality classes in theGinzburg-Landau theory, where \alpha<0.11. Thermal-expansion measurementscorroborate this large positive critical exponent. These results provideinsight into the nature of the critical magnetic fluctuations at atemperature-driven phase transition close to a quantum critical point.

Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2