Nonvanishing Energy Scales at the Quantum Critical Point of CeCoIn5

Details Nonvanishing Energy Scales at the Quantum Critical Point of CeCoIn5 Nonvanishing Energy Scales at the Quantum Critical Point of CeCoIn5

2006-05-04

arxiv.org/abs/cond-mat/0605124v2

Phys. Rev. Lett. 97, 106606 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures (published version)

Scientific paper

10.1103/PhysRevLett.97.106606

Heat and charge transport were used to probe the magnetic field-tuned quantum critical point in the heavy-fermion metal CeCoIn$_5$. A comparison of electrical and thermal resistivities reveals three characteristic energy scales. A Fermi-liquid regime is observed below $T_{FL}$, with both transport coefficients diverging in parallel and $T_{FL}\to 0$ as $H\to H_c$, the critical field. The characteristic temperature of antiferromagnetic spin fluctuations, $T_{SF}$, is tuned to a minimum but {\it finite} value at $H_c$, which coincides with the end of the $T$-linear regime in the electrical resistivity. A third temperature scale, $T_{QP}$, signals the formation of quasiparticles, as fermions of charge $e$ obeying the Wiedemann-Franz law. Unlike $T_{FL}$, it remains finite at $H_c$, so that the integrity of quasiparticles is preserved, even though the standard signature of Fermi-liquid theory fails.

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