Electronic transport and specific heat of Ca-Doped YBa sub(2)Cu sub(3)O sub(x)-single crystals

Measurements of the anisotropic electrical resistivity, the Hall Effect, and the specific heat anomaly at T sub(c) of Ca-doped YBa sub(2)Cu sub(3)O sub(x) single crystals of various Ca and O contents are presented. The transport properties are discussed in terms of charge and spin separated quasipar...

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Bibliographic Details
Published in:Journal of low temperature physics 1996-01, Vol.105 (3-4), p.909-914
Main Authors: Zenner, T, Pelzer, H, Obst, B, Buettner, J, Schweiss, P, Wolf, T, Klaeser, M, Mueller-Vogt, G, Claus, H, Wuehl, H
Format: Article
Language:English
Subjects:
Anisotropy
Barium compounds
Calcium
Doping (additives)
Electric conductivity of solids
Electron transport properties
Hall effect
Quasicrystals
Single crystals
Specific heat of solids
Superconductivity
Yttrium compounds
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Summary:Measurements of the anisotropic electrical resistivity, the Hall Effect, and the specific heat anomaly at T sub(c) of Ca-doped YBa sub(2)Cu sub(3)O sub(x) single crystals of various Ca and O contents are presented. The transport properties are discussed in terms of charge and spin separated quasiparticles and confirm that by doping Ca onto Y sites the hole concentration, n sub(h), can be extended beyond the value achieved with O-doping alone at x identical with 7.0. The jump in the specific heat at T sub(c) which increases monotonously with x up to x identical with 7.0 in Ca-free crystals displays a maximum in highly oxygenated Ca-doped crystals. This maximum, however, is displaced from the T sub(c)(n sub(h)) maximum to higher values of n sub(h), consistent with the model of induced superconductivity in the CuO chains.
ISSN:0022-2291