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# Theory of Fermi-surface pockets and correlation effects in underdoped $\mathrmY\mathrmBa_2\mathrmCu_3\mathrmO_6.5$

Physical Review B, Vol. 77 (Feb 2008), 060504, doi:10.1103/physrevb.77.060504  Key: citeulike:11177016

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### Abstract

The detection of quantum oscillations in the electrical resistivity of YBa2Cu3O6.5 provides evidence for the existence of Fermi-surface pockets in an underdoped cuprate. We present a theoretical study of the electronic structure of YBa2Cu3O7−δ aimed at establishing the nature of these pockets—i.e., CuO2 plane vs CuO chain or BaO. We argue that electron correlation effects, such as orbital-dependent band distortions and anisotropic self-energy corrections, must be taken into account to interpret the quantum oscillation experiments.

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