Thermodynamic evidence of quantum criticality at the pseudogap critical point of cuprate superconductors

ORAL

Abstract

The emergence of superconductivity in the vicinity of a magnetic quantum critical point (QCP) in heavy-fermion, iron-based, organic and electron-doped cuprate superconductors showcases the important relation between quantum criticality and pairing. In hole-doped cuprates, long-range antiferromagnetic order vanishes with doping well before superconductivity appears. Instead, it is around the critical doping p* where the enigmatic pseudogap phase ends that superconductivity exists. The fact that the electrical resistivity displays a linear temperature dependence at low temperature in all these systems, including hole-doped cuprates [1], is suggestive. Here we provide thermodynamic evidence of a QCP in hole-doped cuprates from low-temperature measurements of the specific heat in magnetic fields up to 35 T, high enough to suppress superconductivity. In LSCO, Eu-LSCO, Nd-LSCO and Bi2201, we observe an electronic specific heat that grows as C/T ~ log(1/T) at p ~ p* [2], the classic thermodynamic signature of quantum criticality.
[1] Legros et al., Nature Physics 15, 142 (2019).
[2] Michon et al., Nature 567, 218 (2019).

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Presenters

  • Clément Girod

    • Universite de Sherbrooke

Authors

  • Clément Girod

    • Universite de Sherbrooke

  • Bastien Michon

    • Universite de Sherbrooke

  • Maude le Lizaire

    • Universite de Sherbrooke

  • Adrien Gourgout

    • Universite de Sherbrooke
    • University of Sherbrooke

  • Sven Badoux

    • Universite de Sherbrooke
    • University of Sherbrooke

  • Nicolas Doiron-Leyraud

    • Universite de Sherbrooke
    • University of Sherbrooke

  • Francis Laliberte

    • Universite de Sherbrooke
    • University of Sherbrooke

  • Jozeph Kačmarčík

    • Slovak Academy of Sciences

  • Simon Verret

    • Mila, Université de Montreal & IQ, Université de Sherbrooke
    • Universite de Sherbrooke

  • Jianshi Zhou

    • Geological Sciences, University of Texas at Austin
    • Department of Mechanical Engineering, The University of Texas at Austin
    • Walker Department of Mechanical Engineering, University of Texas at Austin
    • Department of Mechanical Engineering, University of Texas at Austin
    • The University of Texas at Austin
    • University of Texas at Austin
    • University of Texas
    • Materials Science and Engineering program, Department of Mechanical Engineering, University of Texas at Austin

  • Qianli Ma

    • McMaster University

  • Mirela Dragomir

    • McMaster University

  • Hannah A. Dabkowska

    • McMaster University

  • Bruce D. Gaulin

    • Physics, McMaster University
    • McMaster Univ
    • McMaster University
    • Department of Physics & Astronomy, McMaster University

  • Sunseng Pyon

    • Department of Applied Physics, The University of Tokyo
    • University of Tokyo

  • Tomohiro Takayama

    • Max Planck Inst
    • University of Tokyo

  • Hidenori Takagi

    • Max Planck Institute for Solid State Research
    • University of Tokyo

  • Guo-Qing Zheng

    • Okayama University

  • shimpei ono

    • Central Research Institute of Electric Power, Japan
    • CRIEPI
    • Central Research Institute of Electric Power Industry

  • Christophe Marcenat

    • Institut Néel

  • Louis Taillefer

    • Universite de Sherbrooke
    • University of Sherbrooke

  • Thierry Klein

    • Institut Néel