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A view of pseudogap formation and the HTSC mechanism from the perspective of Seebeck results on HgBa2CuO4+

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Seebeck data provide invaluable information on HTSC materials over a wide range of doping content. Seebeck thermoelectric results from Hg-1201 have been examined closely with a view to understanding the normal state pseudogap behaviour and the approach to superconductivity. The nature of the generality in the Seebeck data between all HTSC systems is discussed at some length. The pseudogap treatment of such data from Hildebrand et alis expanded to embrace the details developed earlier relating to stripe phase behaviour and a principally electronic negative-Uperception of HTSC. The input from recent ARPES and tunnelling results is woven into an appraisal of the pseudogap situation compatible with such a viewpoint. This emphasizes that the role with regard to superconductivity of RVB-based spin coupling above Tcis one of preparing and not pre-pairing. The paper further defines the essential input into cuprate HTSC of the two-dimensionality, the square-planar geometry and the action of the saddle points, the two-subsystem mixed-valent organization and above all the resonant shell-filling-driven negative-Ufluctuations.

Document Type: Miscellaneous

Affiliations: H H Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK

Publication date: March 1, 2000


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