Thursday, June 7, 2007, 1:30 pm — Small Seminar Room, Bldg. 510
An unorthodox generalization of the Landau Fermi-liquid
theory is presented, where all electrons are itinerant, and yet they
exhibit the Curie law in spin susceptibility. This is possible when a
Fermi liquid forms a special state called the "fermion condensate",
where the dispersion relation of fermion quasiparticles is flat in
some momentum range. We apply this model to the heavy-fermion metal
CeCoIn5 and explain various properties, such as the sharp rise of spin
susceptibility at low temperatures, the extrapolated residual entropy
of the order of 0.1*ln2 per electron, the temperature-independent
thermal expansion coefficient, and the anomalously high specific-heat
jump at the superconducting transition [1]. We also apply this model
to He-3 films and other correlated fermion systems.
[1] V. A. Khodel, M. V. Zverev, and V. M. Yakovenko,
Phys. Rev. Lett. 95, 236402 (2005).
Hosted by: Robert Konik
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