Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8

Authors :: Yelland, E. A.
Singleton, J.
Mielke, C. H.
Harrison, N.
Balakirev, F. F.
Dabrowski, B.
Cooper, J. R.
Source :: Phys. Rev. Lett. 100, 047003 (2008)
Publication Year :: 2007
Abstract: 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.<br />Comment: Contains revisions addressing referees' comments including a different Fig 1b. 4 pages, 4 figures