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Phys. Rev. Lett. 97, 067005 (2006) [4 pages]

Thermal Conductivity in the Vicinity of the Quantum Critical End Point in Sr3Ru2O7

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F. Ronning1,2, R. W. Hill1,*, M. Sutherland1,†, D. G. Hawthorn1,‡, M. A. Tanatar1,§, J. Paglione1,**, Louis Taillefer1,3, M. J. Graf2, R. S. Perry4,5, Y. Maeno4, and A. P. Mackenzie5
1Department of Physics, University of Toronto, Toronto, Ontario, Canada
2Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
3Université de Sherbrooke, Sherbrooke, Quebec, Canada
4Department of Physics, Kyoto University, Kyoto 606-8502, Japan
5School of Physics and Astronomy, University of St. Andrews, Fife KY16 9SS, Scotland, United Kingdom

Received 13 February 2006; published 10 August 2006

Thermal conductivity of Sr3Ru2O7 was measured down to 40 mK and at magnetic fields through the quantum critical end point at Hc=7.85  T. A peak in the electrical resistivity as a function of the field was mimicked by the thermal resistivity. In the limit as T→0  K, we find that the Wiedemann-Franz law is satisfied to within 5% at all fields, implying that there is no breakdown of the electron despite the destruction of the Fermi liquid state at quantum criticality. A significant change in disorder [from ρ0(H=0  T)=2.1 to 0.5  μΩ cm] does not influence our conclusions. At finite temperatures, the temperature dependence of the Lorenz number is consistent with ferromagnetic fluctuations causing the non-Fermi liquid behavior as one would expect at a metamagnetic quantum critical end point.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.067005
DOI:
10.1103/PhysRevLett.97.067005
PACS:
74.70.Pq, 72.15.Eb, 75.20.En

*Present address: Department of Physics, University of Waterloo, Waterloo, Canada.

†Present address: Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.

‡Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada.

§Permanent address: Institute of Surface Chemistry, NAS Ukraine.

**Present address: Department of Physics, University of California–San Diego, La Jolla, CA, USA.

 
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