One of the keys to the high-temperature superconductivity puzzle is the identification of the energy scales associated with the emergence of a coherent condensate of superconducting electron pairs. These might provide a measure of the pairing strength and of the coherence of the superfluid, and ultimately reveal the nature of the elusive pairing mechanism in the superconducting cuprates. To this end, a great deal of effort has been devoted to investigating the connection between the superconducting transition temperature Tc and the normal-state pseudogap crossover temperature T * . Here we present a review of a large body of experimental data that suggests a coexisting two-gap scenario, i.e. superconducting gap and pseudogap, over the whole superconducting dome.

Library of Congress Cataloging-in-Publication Data. Hiifner, Stefan, 1935-. Photoelectron spectroscopy: principles and applications/Stefan Hiifner. p. em.-(Springer series in solid-state sciences; 82) Includes bibliographical references and index.

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