Abstract
Low-temperature specific heat measurements on single crystalline YbRh 2 Si 2 in small magnetic fields are reported. The phase diagram around its quantum critical point is deduced which confirms the antiferromagnetic and the Fermi-liquid region as deduced from transport measurements. Furthermore, the specific heat reveals that the additional crossover line at T * which was recently observed in field-dependent transport and thermodynamic measurements is independent of the Fermi liquid regime.
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