Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-04-25
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.
Abrahams Elihu
Gegenwart Philip
Geibel Ch.
Krellner Cornelius
Paschen Silke
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