Fermi Surface and Quasiparticle Excitations of overdoped Tl2Ba2CuO6+d by ARPES

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  • 5 March 2005
Abstract
The electronic structure of the high-Tc superconductor Tl2Ba2CuO6+d was studied by ARPES. For a very overdoped Tc=30K sample, the Fermi surface consists of a single large hole pocket centered at (pi,pi) and is approaching a topological transition. Although a superconducting gap consistent with d_x^2-y^2 symmetry is detected, the quasiparticle evolution with momentum and binding energy exhibits a marked departure from the behavior observed in under and optimally doped cuprates. The relevance of these findings to scattering, many-body, and quantum-critical phenomena is discussed.

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