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240b_ps5 - Physics 240B Problem Set#5(20 M L Cohen Spring...

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Physics 240B M. L. Cohen Spring 2008 Problem Set #5 Due: 05/01/08 (20) 1 . For a weakly coupled BCS superconductor such as Al at T = 0, find the ratio of the radius r p characterizing the spherical volume per pair and the coherence length. Express your answer in terms of " /E F . (20) 2. Review an article in your own words on the theory of superconductivity in Buckyball systems. Explain the author's proposal and then be critical. If the paper is from an obscure source, please include a copy. (20 ) 3. For a free Fermi gas where H = " p c p + p # c p , show that
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