Titlebook: Mathematical Methods in Solid State and Superfluid Theory; Scottish Universitie R. C. Clark,G. H. Derrick Book 1968 R. C. Clark and G. H. D

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978-1-4899-6214-0R. C. Clark and G. H. Derrick 1968

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The Microscopic Description of Superfluidity,rfluid concepts, such as the superfluid velocity and the normal mass density, can be defined microscopically; and second, to show the deep unity underlying the descriptions of the superfluidity of low temperature He. and the superfluidity of electrons in superconductors.

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Phonon-Phonon Interaction and Second Sound in Dielectrics,e (a.) creates a phonon of energy .., and ±. = (±.,., .) labels crystal momentum . (within the reduced Brillouin zone), polarization . (= 1, 2, 3) and mode . (= 1,..., . being the number of basis atoms). The phonons interact via anharmonic forces described by ..

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Mathematical Methods in Solid State and Superfluid Theory978-1-4899-6435-9