We report the observation of quantum oscillations in the underdoped cuprate superconductor YBa2Cu4O8 using a tunnel-diode oscillator technique in pulsed magnetic fields up to 85T. There is a clear signal, periodic in inverse field, with frequency 660+/-15T and possible evidence for the presence of two components of slightly different frequency. The quasiparticle mass is m*=3.0+/-0.3m_e. In conjunction with the results of Doiron-Leyraud et al. for YBa2Cu3O6.5, the present measurements suggest that Fermi surface pockets are a general feature of underdoped copper oxide planes and provide information about the doping dependence of the Fermi surface.
@article{arxiv.0707.0057,
title = {Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8},
author = {E. A. Yelland and J. Singleton and C. H. Mielke and N. Harrison and F. F. Balakirev and B. Dabrowski and J. R. Cooper},
journal= {arXiv preprint arXiv:0707.0057},
year = {2008}
}
Comments: Contains revisions addressing referees' comments including a different Fig 1b. 4 pages, 4 figures