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Machida Y, Tomokuni K, Ogura C, et al. Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study. Phys Rev Lett. 2012;109(15):156405doi: 10.1103/PhysRevLett.109.156405.
Machida, Y., Tomokuni, K., Ogura, C., Izawa, K., Kuga, K., Nakatsuji, S., Lapertot, G., Knebel, G., Brison, J. P., & Flouquet, J. (2012). Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study. Physical review letters, 109(15), 156405. https://doi.org/10.1103/PhysRevLett.109.156405
Machida, Y, et al. "Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study." Physical review letters vol. 109,15 (2012): 156405. doi: https://doi.org/10.1103/PhysRevLett.109.156405
Machida Y, Tomokuni K, Ogura C, Izawa K, Kuga K, Nakatsuji S, Lapertot G, Knebel G, Brison JP, Flouquet J. Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study. Phys Rev Lett. 2012 Oct 12;109(15):156405. doi: 10.1103/PhysRevLett.109.156405. Epub 2012 Oct 09. PMID: 23102346.
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Phys Rev Lett. 2012 Oct 12;109(15):156405. doi: 10.1103/PhysRevLett.109.156405. Epub 2012 Oct 09.

Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study.

Physical review letters

Y Machida, K Tomokuni, C Ogura, K Izawa, K Kuga, S Nakatsuji, G Lapertot, G Knebel, J-P Brison, J Flouquet

Affiliations

  1. Department of Physics, Tokyo Institute of Technology, Meguro, Japan.

PMID: 23102346 DOI: 10.1103/PhysRevLett.109.156405

Abstract

The thermoelectric coefficients have been measured down to a very low temperature for the Yb-based heavy-fermion compounds β-YbAlB4 and YbRh2Si2, often considered as model systems for the local quantum criticality case. We observe a striking difference in the behavior of the Seebeck coefficient S in the vicinity of their respective quantum critical point (QCP). Approaching the critical field, S/T is enhanced in β-YbAlB4, but drastically reduced in YbRh2Si2. The ratio of thermopower to specific heat remains constant for β-YbAlB4, but it is significantly reduced near the QCP in YbRh2Si2. In both systems, on the other hand, the Nernst coefficient shows a diverging behavior near the QCP. The interplay between valence and magnetic quantum criticality and the additional possibility of a Lifshitz transition crossing the critical field under magnetic field are discussed as the origin of the different behaviors of these compounds.

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