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Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8

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arxiv 0707.0057 v2 pith:N4SB5MAA submitted 2007-06-30 cond-mat.supr-con cond-mat.str-el

Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8

E. A. Yelland , J. Singleton , C. H. Mielke , N. Harrison , F. F. Balakirev , B. Dabrowski , J. R. Cooper This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords underdopedcupratefermifrequencyoscillationsquantumsurfaceyba2cu4o8
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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.

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