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Transport properties of overdoped Tl cuprates
Authors:Yoshimi Kubo
Affiliation:(1) Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, 305 Tsukuba, Japan
Abstract:To explain the observed inconsistency between the negative thermopowerS and the positive Hall coefficientRH in the overdoped Tl cuprates, tight binding calculations are performed which include both Cu-O and O-O interactions in the CuO2 square lattice. A striking feature of the CuO2 antibonding band is that a holelike Fermi surface is formed even when the band is less than half-filled. This brings about an unusual electron state in which the Hall (cyclotron) mass along the Fermi surface is holelike but the transport mass perpendicular to it is electronlike. This electronlike transport mass contributes to the negative thermopower.We thank N. Hamada, T. Manako, and T. Kondo for helpful discussions.
Keywords:Transport  thermopower  Hall coefficient  tight binding  Tl cuprates
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