Quantum valence criticality in a correlated metal

Science Advances
Kentaro KugaS Nakatsuji

Abstract

A valence critical end point existing near the absolute zero provides a unique case for the study of a quantum version of the strong density fluctuation at the Widom line in the supercritical fluids. Although singular charge and orbital dynamics are suggested theoretically to alter the electronic structure significantly, breaking down the standard quasi-particle picture, this has never been confirmed experimentally to date. We provide the first empirical evidence that the proximity to quantum valence criticality leads to a clear breakdown of Fermi liquid behavior. Our detailed study of the mixed valence compound α-YbAlB4 reveals that a small chemical substitution induces a sharp valence crossover, accompanied by a pronounced non-Fermi liquid behavior characterized by a divergent effective mass and unusual T/B scaling in the magnetization.

References

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Feb 9, 2005·Physical Review Letters·Hitoshi SatoTetsuya Ishikawa
Dec 13, 2006·Physical Review Letters·M DzeroJ Schmalian
May 14, 2009·Physical Review Letters·M KleinH van Löhneysen
Jan 15, 2011·Physical Review Letters·Shinji Watanabe, Kazumasa Miyake
Jan 22, 2011·Science·Yosuke MatsumotoPiers Coleman
Jun 4, 2011·Physical Review Letters·J-P RueffD Jaccard
Sep 26, 2012·Physical Review Letters·J H PixleyQimiao Si
Dec 12, 2012·Physical Review Letters·Aline RamiresA M Tsvelik
Aug 1, 2015·Science·Takahiro TomitaSatoru Nakatsuji

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Citations

May 16, 2020·Scientific Reports·Lucas SquillanteMariano de Souza
Feb 13, 2020··Shinji WatanabeKazumasa Miyake

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Methods Mentioned

BETA
x-ray diffraction
transmission electron microscopy
X-ray

Software Mentioned

PDXL

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