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Phys. Rev. Lett. 95, 236402 (2005) [4 pages]

Curie Law, Entropy Excess, and Superconductivity in Heavy Fermion Metals and Other Strongly Interacting Fermi Liquids

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V. A. Khodel1, M. V. Zverev1, and Victor M. Yakovenko2
1Russian Research Centre Kurchatov Institute, Moscow 123182, Russia
2Condensed Matter Theory Center and Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA

Received 10 August 2005; published 29 November 2005

Low-temperature thermodynamic properties of strongly interacting Fermi liquids with a fermion condensate are investigated. We demonstrate that the spin susceptibility of these systems exhibits the Curie-Weiss law, and the entropy contains a temperature-independent term. The excessive entropy is released at the superconducting transition, enhancing the specific heat jump ΔC and rendering it proportional to the effective Curie constant. The theoretical results are favorably compared with the experimental data on the heavy-fermion metal CeCoIn5, as well as 3He films.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.95.236402
DOI: 10.1103/PhysRevLett.95.236402
PACS: 71.27.+a, 71.10.Ay, 74.70.Tx, 75.30.Cr

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