Multiple energy scales at a quantum critical point

Details Multiple energy scales at a quantum critical point Multiple energy scales at a quantum critical point

2006-04-25

arxiv.org/abs/cond-mat/0604571v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1126/science.1136020

We report thermodynamic measurements in a magnetic-field-driven quantum critical point of a heavy fermion metal, YbRh$_2$Si$_2$. 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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