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Article Dans Une Revue Nature Physics Année : 2014

Degenerate Fermi and non-Fermi liquids near a quantum critical phase transition

Résumé

Recently there is renewed interest in quantum critical phase transitions (QCPT) at T = 0 K in metallic strongly correlated electron systems. From early experimental results, the QCPT in the Kondo-lattice compound YbRh$_2$Si$_2$ is not a case of the ordinary spin density wave (SDW) instability observed in Ce-based Kondo lattices, but a candidate for a novel locally critical case. Here, we observe that coexisting, static Fermi liquid (FL) and non-Fermi liquid (NFL) states are a key feature of the QCPT in YbRh$_2$Si$_2$. By means of nuclear magnetic resonance (NMR) spin–lattice relaxation time (T1) measurements on a single-crystalline sample, we find that the FL and NFL states are invariant, whereas their ratio in a crossover is field dependent near the QCPT. Such a pair of states has remained hidden in Ce compounds, owing presumably to the short lifetimes of the two states. We derive a scaling law for the occupation ratio of the two states, which could be widely applicable to Kondo-lattice systems.

Dates et versions

hal-02064945 , version 1 (12-03-2019)

Identifiants

Citer

S. Kambe, H. Sakai, Y. Tokunaga, G. Lapertot, T. Matsuda, et al.. Degenerate Fermi and non-Fermi liquids near a quantum critical phase transition. Nature Physics, 2014, 10 (11), pp.840-844. ⟨10.1038/nphys3101⟩. ⟨hal-02064945⟩
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