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Physicists are engaged in vigorous debate on the nature of the quantumcritical points (QCP) governing the low-temperature properties of heavy-fermion(HF) metals. Recent experimental observations of the much-studied compoundYbRh2Si2 in the regime of vanishing temperature incisively probe the nature ofits magnetic-field-tuned QCP. The jumps revealed both in the residualresistivity rho_0 and the Hall resistivity R_H, along with violation of theWiedemann-Franz law, provide vital clues to the origin of such non-Fermi-liquidbehavior. The empirical facts point unambiguously to association of theobserved QCP with a fermion-condensation phase transition. Based on thisinsight, the resistivities rho_0 and R_H are predicted to show jumps at thecrossing of the QCP produced by application of a magnetic field, with attendantviolation of the Wiedemann-Franz law. It is further demonstrated thatexperimentally identifiable multiple energy scales are related to the scalingbehavior of the effective mass of the quasiparticles responsible for thelow-temperature properties of such HF metals.

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Nature of the quantum critical point as disclosed by extraordinary  behavior of magnetotransport and the Lorentz number in the heavy-fermion  metal YbRh2Si2