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A two‐phase charge‐density real‐space‐pairing model of high‐Tc superconductivity

A two‐phase charge‐density real‐space‐pairing model of high‐Tc superconductivity It is usually assumed that high‐Tc superconductors have a periodic band structure and a periodic charge density, although amorphous low‐Tc superconductors are known. In this paper, it is suggested that the CuO2 conduction planes of cuprate superconductors consist of regions of two different charge densities which do not normally repeat periodically. It is suggested that the pairing of holes occurs in real space in cuprate superconductors. It is proposed that the hole‐pairing mechanism is magnetic exchange coupling and the pairing force is strong, the pairing energy being greater than kT at room temperature. The bound hole pair is essentially a bipolaron. A real‐space model is very tentatively suggested in which the CuO2 planes of YBa2Cu3O7 contain nanodomains of a 3 × 3 hole lattice surrounded by interfaces one unit cell wide in which the holes are paired. In the superconducting state in this model, the existing hole pairs condense and move coherently and collectively around the insulating nanodomains, like trams running around blocks of houses, with one hole on each tramline. The hole pairs move in an elegant manner with hole pairs hopping from oxygen to oxygen via adjacent copper sites. The model explains the superconducting current being in the ab plane and it also explains the very short coherence lengths. Because the pairing force is strong, the model suggests that room‐temperature superconductivity might be possible in carefully designed new oxide materials. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A Foundations of Crystallography Wiley

A two‐phase charge‐density real‐space‐pairing model of high‐Tc superconductivity

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References (19)

Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S0108767398014093
Publisher site
See Article on Publisher Site

Abstract

It is usually assumed that high‐Tc superconductors have a periodic band structure and a periodic charge density, although amorphous low‐Tc superconductors are known. In this paper, it is suggested that the CuO2 conduction planes of cuprate superconductors consist of regions of two different charge densities which do not normally repeat periodically. It is suggested that the pairing of holes occurs in real space in cuprate superconductors. It is proposed that the hole‐pairing mechanism is magnetic exchange coupling and the pairing force is strong, the pairing energy being greater than kT at room temperature. The bound hole pair is essentially a bipolaron. A real‐space model is very tentatively suggested in which the CuO2 planes of YBa2Cu3O7 contain nanodomains of a 3 × 3 hole lattice surrounded by interfaces one unit cell wide in which the holes are paired. In the superconducting state in this model, the existing hole pairs condense and move coherently and collectively around the insulating nanodomains, like trams running around blocks of houses, with one hole on each tramline. The hole pairs move in an elegant manner with hole pairs hopping from oxygen to oxygen via adjacent copper sites. The model explains the superconducting current being in the ab plane and it also explains the very short coherence lengths. Because the pairing force is strong, the model suggests that room‐temperature superconductivity might be possible in carefully designed new oxide materials.

Journal

Acta Crystallographica Section A Foundations of CrystallographyWiley

Published: Jan 1, 1999

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