Thermoelectric study of quantum criticality in heavy-fermion metals

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Quantum critical phenomena of the heavy-fermion materials have been studied by the low-temperature thermoelectric coefficient measurements. As a result, distinct nature of quantum criticality between two representative Yb-based quantum critical materials β-YbAlB4 and YbRh 2 Si2 has been revealed by contrasting behaviors of the Seebeck coefficient near their quantum critical points (QCP). Moreover, a satisfactory of the Wiedemann-Franz law has been verified in YbRh 2 Si2 at the QCP. These results place strong constraint on models for the quantum criticality of these materials.