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Science 16 February 2007:
Vol. 315. no. 5814, pp. 969 - 971
DOI: 10.1126/science.1136020
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Reports

Multiple Energy Scales at a Quantum Critical Point

P. Gegenwart,1*{dagger} T. Westerkamp,1 C. Krellner,1 Y. Tokiwa,1{ddagger} S. Paschen,1§ C. Geibel,1 F. Steglich,1 E. Abrahams,2 Q. Si3*

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.

1 Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
2 Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855, USA.
3 Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA.

{dagger} Present address: First Physics Institute, University of Goettingen, 37077 Goettingen, Germany.

{ddagger} Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

§ Present address: Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria.

* To whom correspondence should be addressed. E-mail: pgegenw{at}gwdg.de (P.G.); qmsi{at}rice.edu (Q.S.)

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Bilayer 3He: A Simple Two-Dimensional Heavy-Fermion System with Quantum Criticality.
M. Neumann, J. Nyeki, B. Cowan, and J. Saunders (2007)
Science 317, 1356-1359
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Science. ISSN 0036-8075 (print), 1095-9203 (online)