Nodal Fermi surface pocket approaching an optimal quantum critical point in YBCO

ORAL

Abstract

I present new quantum oscillation measurements over the entire underdoped regime in YBa$_2$Cu$_3$O$_{6+x}$ and YBa$_2$Cu$_4$O$_8$ using ultra-high magnetic fields to destroy superconductivity and access the normal ground state. A robust small nodal Fermi surface created by charge order is found to extend over the entire underdoped range, exhibiting quantum critical signatures approaching optimal doping.

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Authors

  • Suchitra Sebastian

    • Cavendish Laboratory, Cambridge University
    • University of Cambridge

  • Beng Tan

    • University of Cambridge

  • Gilbert Lonzarich

    • University of Cambridge

  • Brad Ramshaw

    • University of British Columbia
    • National High Magnetic Field Laboratory, Los Alamos

  • Neil Harrison

    • NHMFL-LANL
    • Los Alamos National Labs.
    • National High Magnetic Field Laboratory, Los Alamos

  • Fedor Balakirev

    • National High Magnetic Field Laboratory, Los Alamos

  • Chuck Mielke

    • Los Alamos National Laboratory - NHMFL-PFF
    • National High Magnetic Field Laboratory, Los Alamos

  • S. Sabok

    • Northern Illinois University
    • Physics, Northern Illinois University, De Kalb, IL 60115
    • Argonne National Laboratory

  • S. Sabok

    • Northern Illinois University
    • Physics, Northern Illinois University, De Kalb, IL 60115
    • Argonne National Laboratory

  • Ruixing Liang

    • The University of British Columbia
    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia; Quantum Matter Institute, University of British Columbia

  • Doug Bonn

    • The University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia; Quantum Matter Institute, University of British Columbia
    • Univ British Columbia
    • University of British Columbia

  • Walter Hardy

    • The University of British Columbia
    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia; Quantum Matter Institute, University of British Columbia