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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