Leon N. Cooper's BCS: 50 years PDF

By Leon N. Cooper

ISBN-10: 9814304646

ISBN-13: 9789814304641

ISBN-10: 9814304654

ISBN-13: 9789814304658

The BCS idea of superconductivity constructed in 1957 via Bardeen, Cooper and Schrieffer has been remarkably winning in explaining the houses of superconductors. additionally, strategies from BCS were included into diversified fields of physics, from nuclear physics and dense quark topic to the present common version. functional purposes comprise SQUIDs, magnetic resonance imaging, superconducting electronics and the transmission of electrical energy. This useful booklet is a compilation of either a old account and a dialogue of the present kingdom of thought and scan. With contributions from many renowned scientists, it goals to introduce scholars and researchers to the origins, the influence and the present nation of the BCS idea.

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Example text

In working out the properties of our simplified model and comparing with experimental results on real metals, we were continually amazed at the excellent agreement obtained. If there was serious discrepancy, it was usually found on rechecking that an error was made in the calculations. Everything fitted together neatly like the pieces of a jigsaw puzzle. Accordingly, we were unprepared for the skepticism with which the theory was greeted in some quarters. Those most skeptical had generally worked long and hard on superconductivity theory themselves, and had their own ideas of what the theory should be like.

5). Instead of using Eq. (5), they simply proposed to drop the time derivatives, leading to a new material’s equation for superconductors: ∇× ne2 B. (6) mc This phenomenological London equation guarantees that the field decays to zero on the length λL , referred to as the London penetration depth. 5in J. ” In other words, London and London recognized that superconductors are perfect diamagnets. With the Nazi regime coming into power in 1933 a sudden shift of the research efforts from Germany to the United States and England took place, changing the priorities of numerous researchers.

In second order, there is an effective interaction between the quasi-particle excitations of the normal state which is the sum of the attractive phonon-induced interaction and a screened Coulomb interaction. In the Handbuch article, I suggested that one should take the complete interaction, not just the diagonal self-energy terms, and use it as the basis for a theory of superconductivity. The next major step was made by Cooper, who, following up this approach, showed that if there is an effective attractive interaction, a pair of quasi-particles above the Fermi sea will form a bound state no matter how weak the interaction.

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BCS: 50 years by Leon N. Cooper


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