Multiple energy scales at a quantum critical point.

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Publication Details

Output type: Journal article

Author list: Gegenwart, Westerkamp, Krellner, Tokiwa, Paschen, Geibel, Steglich, Abrahams, Si

Publisher: American Association for the Advancement of Science

Publication year: 2007

Volume number: 315

Issue number: 5814

Start page: 969

End page: 71

Number of pages: -897

ISSN: 0036-8075

eISSN: 1095-9203

Languages: English-Great Britain (EN-GB)

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Open access status: green

Full text URL: https://arxiv.org/pdf/cond-mat/0604571

Abstract

We report thermodynamic measurements in a magnetic-field-driven quantum critical point of a heavy fermion metal, YbRh2Si2. The data provide evidence for an energy scale in the equilibrium excitation spectrum that is in addition to the one expected from the slow fluctuations of the order parameter. Both energy scales approach zero as the quantum critical point is reached, thereby providing evidence for a new class of quantum criticality.

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