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Scattering, Fermi surface reconstruction and the gap above Tc in cuprate superconductors

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A longstanding dispute in hole-doped cuprate high-temperature superconductors concerns the origin of an energy gap, known as the pseudogap, which persists high above the superconducting transition temperature (Tc). Does it represent precursor superconductivity, or some other non-superconducting order? By examining a range of thermodynamic, transport and spectroscopic data I will demonstrate that the answer is “yes” to both. In the overdoped regime the non-mean-field temperature dependences are well described by a pairing gap extending above Tc in the presence of strong scattering. While the underdoped data points to a second gap originating from a reconstruction of the Fermi surface in which the carrier density drops by one hole per copper atom. This implies that the phase diagram of the high-Tc cuprates is actually a blend of the two leading proposals, and that the two opposing sides of this dispute are each partially correct.

This talk is part of the Quantum Matter Seminar series.

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