THE STUDY OF ELECTRONIC STRUCTURE AND COMPUTATION OF TRANSITION PHASE PARAMETERS IN HIGH TEMPERATURE SUPERCONDUCTORS
THE STUDY OF ELECTRONIC STRUCTURE AND COMPUTATION OF TRANSITION PHASE PARAMETERS IN HIGH TEMPERATURE SUPERCONDUCTORS
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Date
2000-08
Authors
IBEH, GODWIN JOSEPH
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Abstract
Investigations on the electronic structure of high temperature superconductors are studied. This work showed that there have been tremendous efforts devoted to developing suitable theories and mechanisms of the high temperature superconductivity. Many of these theories are BCS-based even though certain behaviour of the high Tc oxide superconductors such as: the linear dc resistivity with temperature, a Hall coefficient that is temperature dependent, the presence of short coherence lengths etc., suggest that the normal state cannot be described by a Fermiliquid. The study also covers details of possible applications of the devices using high-Tc superconductors, which are mostly based on the Josephson junction of the high-Tc oxide superconductors. An attempt has been made to evaluate the two- and three - dimensional phase transition temperatures of some of the known high-temperature superconductors,
based on a recent phenomenological theory of cuprate oxides. The theory assumes
two criteria used to calculate the superconducting transition temperatures. One is that the quantum wavelength is of the order of the electron pair spacing. The other is that the fraction of the normal carriers exists as Cooper pairs at Tc. Thus, the model provides a self-consistent condition that the number of pairs that Bose-Einstein condenses is approximately equal to Tc itself. The results of this calculation are found to agree reasonably well with the available experimental data.
Description
Being a thesis submitted to the Postgraduate School, Ahmadu Bello University, Zaria
in Partial fulfillment of the requirement for the award of Master of Science in Physics.
Keywords
STUDY, ELECTRONIC, STRUCTURE, COMPUTATION, TRANSITION, PHASE, PARAMETERS, HIGH, TEMPERATURE, SUPERCONDUCTORS