Multiple energy scales at a quantum critical point

P. Gegenwart; T. Westerkamp; C. Krellner; Y. Tokiwa; S. Paschen; C. Geibel; F. Steglich; E. Abrahams; Q. Si

doi:10.1126/science.1136020

Multiple energy scales at a quantum critical point

Strongly Correlated Electrons 2009-11-11 v2

Authors: P. Gegenwart , T. Westerkamp , C. Krellner , Y. Tokiwa , S. Paschen , C. Geibel , F. Steglich , E. Abrahams , Q. Si

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Abstract

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.

Keywords

quantum critical point critical phenomena

Cite

@article{arxiv.cond-mat/0604571,
  title  = {Multiple energy scales at a quantum critical point},
  author = {P. Gegenwart and T. Westerkamp and C. Krellner and Y. Tokiwa and S. Paschen and C. Geibel and F. Steglich and E. Abrahams and Q. Si},
  journal= {arXiv preprint arXiv:cond-mat/0604571},
  year   = {2009}
}

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