By Leon N. Cooper
The BCS conception of superconductivity built in 1957 by way of Bardeen, Cooper and Schrieffer has been remarkably profitable in explaining the homes of superconductors. furthermore, suggestions from BCS were included into assorted fields of physics, from nuclear physics and dense quark subject to the present general version. sensible purposes comprise SQUIDs, magnetic resonance imaging, superconducting electronics and the transmission of electrical energy. This useful ebook is a compilation of either a old account and a dialogue of the present kingdom of conception and test. With contributions from many renowned scientists, it goals to introduce scholars and researchers to the origins, the effect and the present nation of the BCS conception.
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Extra resources for BCS: 50 years
It was all algebraic and I didn’t have to go to a computer, or you know, there weren’t terms I just threw away because I just couldn’t handle them, but the whole thing was analytic. There were certain beauties, a simplicity, which — you might call it esthetics. I think that’s — to my mind, that’s a phony word, it implies more than that. But, it was sort of nice and I liked it. 5in J. R. Schrieffer Fig. 7. Cooper circa 1972. Q: So, Now You Had It That Wave Function. Did You Feel that Things Were Falling into Place?
For a discussion of Kelvin’s role in motivating Kamerlingh Onnes’ experiment, see Ref. 7. We know now that superconductivity is a macroscopic quantum eﬀect. Even though many elements of the new quantum theory were developed by Planck, Bohr, Sommerfeld, Einstein and others starting in 1900, it is clear in hindsight that it was hopeless to explain superconductivity before the formulation of quantum mechanics by Heisenberg8 and Schr¨ odinger9 during 1925–1926. ”10 The vague ideas resulted out of his own eﬀorts to understand superconductivity using the concept of “molecular conduction chains” that carry supercurrents.
I thought that it might be possible to extend the Bloch one-electron model to account for superconductivity. A periodic potential introduces Brillouin-zone boundaries in k space, with an energy gap at the boundary proportional to the Fourier coefficient of the potential. If one could produce zone boundaries at nearly all parts of the Fermi surface, one would get a lowering of energy of the electrons in states just inside the surface. No matter how complex the Fermi surface, it should be possible to accomplish this by introducing many small periodic distortions of the lattice corresponding to a very large complex unit cell.
BCS: 50 years by Leon N. Cooper