Transport mechanisms in high Tc Bismuth-based oxide superconductors. | [Science International • 2008]

Author(s):

1. Fazl-Ur-Rehman: University of Balochistan, Quetta, Pakistan

2. Syed Mohsin Raza: University of Balochistan, Quetta, Pakistan

3. Mushtaq Ahmed Gormani: University of Balochistan, Quetta, Pakistan

4. Muhammad Ashfaq Ahmed: University of Balochistan, Quetta, Pakistan

Abstract:

We apply our transport theory on high temperature oxide superconductor was presented. Our calculations on bismuth based high temperature superconductors suggest that the polarons may exist. There exists, no bipolarons. The polarons are produced due to free or dangling bonds of oxygen. The Cooper pairs while remaining on a pseudo Fermi surface behave like weak fermions. When the Cooper pairs become free they behave as spinless bosons. The binding energies of Cooper pairs both in a weak fermions system and for spinless bosons are calculated. A kind of semimetallic transition is responsible for high temperature superconductivity and is temperature independent. There is no electron-polaron coupling for high temperature superconductors. High temperature oxide superconductors before the onset of superconductivity are found to be Mott insulating materials. Our results are in conformity with theory.

Page(s): 91-96

DOI: DOI not available

Published: Journal: Science International, Volume: 20, Issue: 2, Year: 2008

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