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Flux quantization experiments indicate that the carriers, Cooper pairs (pairons), in the supercurrent have charge magnitude 2e, and that they move independently. Josephson interference in a Superconducting Quantum Int- ference Device (SQUID) shows that the centers of masses (CM) of pairons move as bosons with a linear dispersion relation. Based on this evidence we develop a theory of superconductivity in conventional and mate- als from a unified point of view. Following Bardeen, Cooper and Schrieffer (BCS) we regard the phonon exchange attraction as the cause of superc- ductivity. For cuprate superconductors, however, we take account of both optical- and acoustic-phonon exchange. BCS started with a Hamiltonian containing "electron" and "hole" kinetic energies and a pairing interaction with the phonon variables eliminated. These "electrons" and "holes" were introduced formally in terms of a free-electron model, which we consider unsatisfactory. We define "electrons" and "holes" in terms of the cur- tures of the Fermi surface. "Electrons" (1) and "holes" (2) are different and so they are assigned with different effective masses: Blatt, Schafroth and Butler proposed to explain superconductivity in terms of a Bose-Einstein Condensation (BEC) of electron pairs, each having mass M and a size. The system of free massive bosons, having a quadratic dispersion relation: and moving in three dimensions (3D) undergoes a BEC transition at where is the pair density.

Reads R to L (Japanese Style) for teen audiences." The Ninth Legion marched into the mists of northern Britain ...and they were never seen again. Four thousand men disappeared and their eagle standard was lost. It's a mystery that's never been solved, until now ...So begins the story of The Eagle of the Ninth, set against a backdrop of Roman Britain and featuring a young soldier, Marcus Aquila, who sets off into the unknown north to find out what happened to the lost legion. Following on from this are The Silver Branch in which two young soldiers uncover a plot to overthrow the Emperor, and the Carnegie Medal-winning, The Lantern Bearers which is set at a time when the Romans are leaving the shores of Britain and tells of Aquila and Theory of High Temperature Superconductivity free download pdf his quest for revenge. This beautiful boxed set of these three classic stories is the perfect gift for readers young and old.

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Author: S. Fujita,Salvador Godoy
Number of Pages: 374 pages
Published Date: 04 Dec 2010
Publisher: Springer
Publication Country: Dordrecht, Netherlands
Language: English
ISBN: 9789048158836
Download Link: Click Here
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