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Phase Separation in Cuprate Superconductors - Proceedings of the second international workshop on "Phase Separation in Cuprate Superconductors" September 4 - 10, 1993, Cottbus, Germany (Paperback, 1994 ed.)
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Phase Separation in Cuprate Superconductors - Proceedings of the second international workshop on "Phase Separation in Cuprate Superconductors" September 4 - 10, 1993, Cottbus, Germany (Paperback, 1994 ed.)
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Phase separation has become a fascinating subject in the discussion
of cuprate superconductors. All these materials have layered
structures containing CU02 planes as the most important building
blocks. They are coupled only weakly so that the electronic
properties show a nearly two-dimensional behaviour. Due to
correlations the undoped compounds are insulators of the Mott
Hubbard type exhibiting long-range antiferromagnetic order. Upon
doping a rich scenario of physical phenomena appears: Even at low
hole concentra tions the antiferromagnetic ordering temperature is
reduced drastically and spin-glass behaviour as well as a hopping
type conductivity can be observed. Further doping leads to
metallic-like conductivity and below Tc to super conductivity. In
this doping regime antiferromagnetic fluctuations are still
observed. At very high charge carrier densities superconductivity
is lost and the systems show pure metallic conduction without
,magnetic correlations. One of the most interesting phenomena in
high-T c research is the interplay between magnetism and
conductivity or superconductivity. Especially the behaviour of
charge carriers in the antiferromagnetic background raises a number
of open questions. Two scenarios become possible: the carriers tend
to delocalize over the whole crystal forming a homogeneous state
with band-like structure or they separate into hole-rich
(conducting, superconducting) and hole-poor (insulating,
antiferromagnetic) phases leading to an inhomogeneous structure.
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