BCS: 50 years by Leon N. Cooper

By Leon N. Cooper

The BCS thought of superconductivity built in 1957 by means of Bardeen, Cooper and Schrieffer has been remarkably winning in explaining the homes of superconductors. furthermore, strategies from BCS were integrated into different fields of physics, from nuclear physics and dense quark subject to the present average version. useful functions 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 thought and scan. With contributions from many sought after scientists, it goals to introduce scholars and researchers to the origins, the impression and the present nation 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.

The consequences, you know, weren’t clear to me or weren’t important. Q: And You Were Also Very Young. 25? Right. I’d seen a certain amount of physics. And I didn’t have perspective. I didn’t have any basis to judge right or wrong, so I assumed that this was, perhaps not wrong, but it was a beginning of another interesting idea. Like Leon had a very good idea and it worked to a certain extent. I assumed that this was perhaps a good idea and it would move one along, but this wasn’t the solution to the problem.

Leon’s discovery, that a pair is unstable, suggested a direction we should move to understand which hunk of the Hamiltonian we should look at — which piece of the total interaction was important . . So we started thinking about how we could make a many-body theory which took into account many pairs at the same time . . 5in J. R. Schrieffer Fig. 3. Bardeen. Fig. 4. Cooper. 5in The Road to BCS ch2 25 where all electrons are treated, but we treat them in the second quantization formalism corresponding to pairs of zero momentum, and try and solve that problem” .

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