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Taillefer, The remarkable underlying ground states of cuprate superconductors, Annual Review of Condensed Matter Physics, 2019","review_link":"https://doi.org/10.1146/annurev-conmatphys-031218-013210","review_verified":"true","summary":"Underdoped cuprates, which carry fewer added holes than the optimum, lose many low-energy electron states above the superconducting temperature (the pseudogap) and develop weak periodic ripples in electron density. Whether these effects mark a new phase of matter, and what reorganizes the Fermi surface (the boundary between occupied and empty electron momenta), is not settled.","title":"Cuprate pseudogap, charge order and Fermi-surface reconstruction","topic_ref":null,"why":"The pseudogap region is where cuprate theories disagree most, and its endpoint lies near the strange metal and the doping of highest 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