Sources of Quantum Protection in High-Tc Superconductivity

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Science  21 Apr 2000:
Vol. 288, Issue 5465, pp. 480-482
DOI: 10.1126/science.288.5465.480

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The layer-structure cuprates with high superconducting transition temperatures T c exhibit a number of anomalous electronic properties in both superconducting and normal states. These anomalies are ascribed to the existence of independent spectra of excitations for charge and for spin, signaling a collective state, a “quantum protectorate.”

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