Quantum Oscillations in the Underdoped Cuprate YBa$_{2}$Cu$_{4}$O$_{8}$

ORAL

Abstract

The quantum oscillations (QOs) seen in the underdoped cuprate superconductor YBa$_{2}$Cu$_{4}$O$_{8}$ (Y124) in magnetic fields up to $B$=85T [1] are strong evidence for a well-defined Fermi surface (FS) in Y124 at low temperature $T$ and high $B$. The QO frequency $F$=660$\pm $15T, implies a FS pocket with 2.4{\%} of the full Brillouin zone (BZ) area. Taken with earlier work [2], our data suggest FS pockets are generic to underdoped CuO$_{2}$ planes and give the first hint of doping dependence of the FS. We discuss the carrier concentration implied by the QOs within various models. Comparison of the T-linear specific heat $\gamma $ (from QO quasiparticle mass m*) to $\gamma $ estimated from zero-field specific heat measurements constrains the number of FS pockets present in the BZ and supports a reduced BZ due e.g. to a charge/spin density wave or ordered orbital currents. [1] E. A. Yelland et al, arXiv:0707.0057. [2] N. Doiron-Leyraud et al, Nature 446, 565 (2007)

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Authors

  • Edward Yelland

    University of Bristol, University of St Andrews, UK

  • John Singleton

    LANL

  • Chuck Mielke

    MPA-NHMFL, Los Alamos National Laboratory, National High magnetic Field Laboratory, Los Alamos National Laboratory, LANL

  • Neil Harrison

    LANL, National High magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos National Laboratory

  • Fedor Balakirev

    National High Magnetic Field Laboratory, LANL, Los Alamos, NM, NHMFL - Los Alamos, LANL, Los Alamos National Laboratory, MagLab/LANL

  • Bogdan Dabrowski

    Department of Physics, Northern Illinois University, DeKalb, IL 60115, Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, Northern Illinois University

  • Marcin Matusiak

    University of Cambridge

  • John Cooper

    University of Cambridge, Department of Physics, University of Cambridge