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Pseudogap Phase and the Quantum-Critical Point in Copper-Oxide Metals

Pseudogap Phase and the Quantum-Critical Point in Copper-Oxide Metals

A systematic solution of a model for copper oxides reveals a line of transitions ${T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}T}_{p}(x)$ for $x$, the doping away from half filling less than a critical value, to a phase with broken time reversal and rotational symmetry. The single-particle spectrum in this phase is calculated to have a gap …