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Thermoelectric response near a quantum critical point of beta-YbAlB4 and YbRh2Si2: A comparative study

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arxiv 1202.2753 v1 pith:ELLNSBQJ submitted 2012-02-13 cond-mat.str-el

Y. Machida , K. Tomokuni , C. Ogura , K. Izawa , K. Kuga , S. Nakatsuji , G. Lapertot , G. Knebel
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J.-P. Brison J. Flouquet
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classification cond-mat.str-el
keywords nearybrh2si2beta-ybalb4criticalbehaviorcoefficientdrasticallypoint
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The thermoelectric coefficients have been measured on the Yb-based heavy fermion compounds beta-YbAlB4 and YbRh2Si2 down to a very low temperature. We observe a striking difference in the behavior of the Seebeck coefficient, S in the vicinity of the Quantum Critical Point (QCP) in the two systems. As the critical field is approached, S/T enhances in beta-YbAlB4 but is drastically reduced in YbRh2Si2. While in the former system, the ratio of thermopower-to-specific heat remains constant, it drastically drops near the QCP in YbRh2Si2. In both systems, on the other hand, the Nernst coefficient shows a diverging behavior near the QCP. The results provide a new window to the way various energy scales of the system behave and eventually vanish near a QCP.

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  1. Thermopower across Fermi-volume-changing quantum phase transitions without translational symmetry breaking

    cond-mat.str-el 2024-12 conditional novelty 6.0 of 10

    A large-N model of a Fermi-volume-changing transition without symmetry breaking predicts a skewed marginal Fermi liquid with large asymmetric thermopower, matching CeRhIn5 and Nd-LSCO data.

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