BCS: 50 years by Leon N. Cooper

By Leon N. Cooper

The BCS concept of superconductivity constructed in 1957 through Bardeen, Cooper and Schrieffer has been remarkably profitable in explaining the houses of superconductors. moreover, strategies from BCS were integrated into different fields of physics, from nuclear physics and dense quark subject to the present normal version. sensible purposes contain SQUIDs, magnetic resonance imaging, superconducting electronics and the transmission of electrical energy. This precious publication is a compilation of either a old account and a dialogue of the present nation of concept and test. With contributions from many widespread scientists, it goals to introduce scholars and researchers to the origins, the impression and the present country of the BCS concept.

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So I set that down and then I looked at it, and I realized that that didn’t conserve the number of electrons. It was a variable number of electrons and that had worried me, I remember. 5in The Road to BCS Fig. 6. ch2 27 Schrieffer as a graduate student. ” And I said, “Gee, I don’t know if it’s going to work, but it seems to me a reasonable approach. ” So I guess it was on the subway, I scribbled down the wave function and I calculated the beginning of that expectation value and I realized that the algebra was very simple.

There was a great blackboard, and there were always two or three people at the blackboard, arguing and discussing. So that was fun. They were all students there. 5in The Road to BCS ch2 23 Fig. 2. University of Illinois at Urbana-Champaign Department of Physics circa 1957. The “Institute for Retarded Study” (indicated by arrow) was on the top floor on the right. Q: That Seems Marvelous! ” How Did You All Interact? Bardeen and Cooper shared an office, and that was very important. They could wheel around their chairs and talk to each other continually.

One then finds that the wave function Φ = exp(iδp· i ri / )Ψ has a lower energy than Ψ if the variational parameter δp points opposite to P . Thus, Ψ cannot be the ground state unless j = 0 for the purely electronic problem, Eq. (3). This result clearly invalidated Landau’s and Bloch’s proposals. The second idea proposed in 1932 by Bohr and Kronig was that superconductivity would result from the coherent quantum motion of a lattice of electrons. Given Bloch’s stature in the field, theorists like Niels Bohr where eager to discuss their own ideas with him.

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