A String Approximation for Cooper Pair in High-T$_{\bf c}$ superconductivity

Details A String Approximation for Cooper Pair in High-T$_{\bf c}$ superconductivity A String Approximation for Cooper Pair in High-T$_{\bf c}$ superconductivity

2000-01-19

arxiv.org/abs/cond-mat/0001257v2

Phys.Rev. B64 (2001) 024522

Physics

Condensed Matter

Superconductivity

Essential changes: (a) the section is added in which it is shown that Green's function method in the superconductivity theory

Scientific paper

10.1103/PhysRevB.64.024522

It is assumed that in some sense the High-T$_c$ superconductivity is similar to the quantum chromodynamics (QCD). This means that the phonons in High-T$_c$ superconductor have the strong interaction between themselves like to gluons in the QCD. At the experimental level this means that in High-T$_c$ superconductor exists the nonlinear sound waves. It is possible that the existence of the strong phonon-phonon interaction leads to the confinement of phonons into a phonon tube (PT) stretched between two Cooper electrons like a hypothesized flux tube between quark and antiquark in the QCD. The flux tube in the QCD brings to a very strong interaction between quark-antiquark, the similar situation can be in the High-T$_c$ superconductor: the presence of the PT can essentially increase the binding energy for the Cooper pair. In the first rough approximation the PT can be approximated as a nonrelativistic string with Cooper electrons at the ends. The BCS theory with such potential term is considered. It is shown that Green's function method in the superconductivity theory is a realization of discussed Heisenberg idea proposed by him for the quantization of nonlinear spinor field. A possible experimental testing for the string approximation of the Cooper pair is offered.

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