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. 2008 Feb 1;100(4):047004.
doi: 10.1103/PhysRevLett.100.047004. Epub 2008 Feb 1.

Small Fermi surface pockets in underdoped high temperature superconductors: observation of Shubnikov-de Haas oscillations in YBa2Cu4O8

A F Bangura  1 , J D Fletcher, A Carrington, J Levallois, M Nardone, B Vignolle, P J Heard, N Doiron-Leyraud, D Leboeuf, L Taillefer, S Adachi, C Proust, N E Hussey
Affiliations

Small Fermi surface pockets in underdoped high temperature superconductors: observation of Shubnikov-de Haas oscillations in YBa2Cu4O8

A F Bangura et al. Phys Rev Lett. .

Abstract

We report the observation of Shubnikov-de Haas oscillations in the underdoped cuprate superconductor YBa2Cu4O8 (Y124). For fields aligned along the c axis, the frequency of the oscillations is 660+/-30 T, which corresponds to approximately 2.4% of the total area of the first Brillouin zone. The effective mass of the quasiparticles on this orbit is measured to be 2.7+/-0.3 times the free electron mass. Both the frequency and mass are comparable to those recently observed for ortho-II YBa2Cu3O6.5 (Y123-II). We show that although small Fermi surface pockets may be expected from band-structure calculations in Y123-II, no such pockets are predicted for Y124. Our results therefore imply that these small pockets are a generic feature of the copper oxide plane in underdoped cuprates.

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