Temperature-dependent Fermi surface evolution in heavy fermion CeIrIn5

Details Temperature-dependent Fermi surface evolution in heavy fermion CeIrIn5 Temperature-dependent Fermi surface evolution in heavy fermion CeIrIn5

2011-05-12

arxiv.org/abs/1105.2402v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages main article,3 figures for the main article, 2 page Supplementary information, 2 figures for the Supplementary informa

Scientific paper

In Cerium-based heavy electron materials, the 4f electron's magnetic moments bind to the itinerant quasiparticles to form composite heavy quasiparticles at low temperature. The volume of the Fermi surfacein the Brillouin zone incorporates the moments to produce a "large FS" due to the Luttinger theorem. When the 4f electrons are localized free moments, a "small FS" is induced since it contains only broad bands of conduction spd electrons. We have addressed theoretically the evolution of the heavy fermion FS as a function of temperature, using a first principles dynamical mean-field theory (DMFT) approach combined with density functional theory (DFT+DMFT). We focus on the archetypical heavy electrons in CeIrIn5, which is believed to be near a quantum critical point. Upon cooling, both the quantum oscillation frequencies and cyclotron masses show logarithmic scaling behavior (~ ln(T_0/T)) with different characteristic temperatures T_0 = 130 and 50 K, respectively. The resistivity coherence peak observed at T ~ 50 K is the result of the competition between the binding of incoherent 4f electrons to the spd conduction electrons at Fermi level and the formation of coherent 4f electrons.

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