By Ralph Dougherty, J. Daniel Kimel
''While the macroscopic phenomenon of superconductivity is celebrated and in sensible use world wide in lots of industries, together with MRIs in clinical diagnostics, the present theoretical paradigm for superconductivity (BCS conception) suffers from a few barriers, no longer the least of that is an sufficient rationalization of hot temperature superconductivity. This publication reports the present conception and its boundaries and Read more...
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Extra resources for Superconductivity revisited
Example text
15] gives data on both electric conductance and resistance quanta in a mix of two- and four-terminal experiments with a ballistic quantum wire at a temperature of 300 mK. Gallium arsenide/ aluminum gallium arsenide, GaAs/AlGaAs, heterostructure nanowires were utilized under conditions of essentially zero electron scattering to study resistance and conductance as a function of gate voltage in these experiments. The conductor wires were prepared with closely controlled geometry by epitaxial growth onto the cleaved surface of a high-quality GaAs/AlGaAs heterostructure.
That Sommerfeld’s electron gas model gave a good account of the relationship between electrical conductivity and thermal conductivity implies that for the bulk of heat transfer and electron scattering, neither one of the processes has a intimate involvement with the atomic lattice of the metal. This was not the case. This observation leads to the conclusion that the relationship memorialized by the Wiedemann–Franz law involves only the electronic (electron gas) structure of the metal. Data cited throughout this book indicates that electron scattering in metals is quantum mechanically controlled by the same paradigm that is responsible for other electronic properties of materials.
The structure of the atoms, which is directly available in the periodic table, and the interatomic interactions in the condensed phases that form the conductors or insulators appear to be responsible for the pattern that appears. The lowest energy conduction band of the solid controls the possibility of superconductivity for an element. If that band has s basis wave functions, the lowest temperature conduction band for the system will always be dissipative because of Fermi contact electron scattering.
