Spin fluctuations and high temperature superconductivity in the copper oxides
Monthoux, Philippe Henri
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https://hdl.handle.net/2142/18884
Description
Title
Spin fluctuations and high temperature superconductivity in the copper oxides
Author(s)
Monthoux, Philippe Henri
Issue Date
1992
Doctoral Committee Chair(s)
Pines, David
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
spin-fluctuation-induced superconductivity
spin fluctuations
High Temperature Superconductivity
copper oxide
antiferromagnetically correlated copper oxide
weak coupling approximation
quasiparticles
Language
en
Abstract
The author reports studies of spin-fluctuation-induced superconductivity
in the antiferromagnetically correlated copper oxide high temperature superconductors.
The spin fluctuation mechanism is first studied within a weak coupling approximation.
It is shown that the retarded interaction between quasiparticles
on a 2D square lattice induced by the exchange of antiferromagnetic paramagnons
leads uniquely to a transition to a superconducting state with dx2-y2
symmetry. The effective quasiparticle interaction responsible for superconductivity
possesses considerable structure in both momentum and frequency space,
and it is shown, by explicit calculations, that if one wishes to obtain quantitatively
meaningful results it is essential to allow for that structure in solving
the full integral equations which determine the superconducting transition temperature
and the superconducting properties. With a spin excitation spectrum
and a quasiparticle-paramagnon coupling determined by fits to normal state
experiments, the author obtains high transition temperatures and energy gap
behaviors comparable to those measured for YBa2Cu301, YBa2Cu306.63 , and
Lai.ssSro.Is Cu04.
The author then studies the influence of strong coupling effects, and high
temperature superconductivity is obtained. This requires the solution of the
Eliashberg equations taking full account of the momentum and frequency dependence
of the effective interaction; approximations commonly used for phononinduced
superconductivity fail to yield quantitatively meaningful results.
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