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|Type:||Artigo de periódico|
|Title:||Thermodynamics Of Liquid He4|
|Abstract:||Using the equation-of-motion method we derive, based on the pair approximation [Hartree-Fock (HF), BCS] of the hard-sphere model for superfluid He, the Bogoliubov equation for the superfluid phase. At the temperature T=Tλ the off-diagonal pairing factor (BCS) has to vanish, and the excitation energy must become that of the HF solution. This condition yields a transition temperature Tλ=2.3°K. The superfluid density ρS as a function of temperature is also investigated. Furthermore assuming the net translational kinetic energy of the liquid to be ET=(12) Ω(ρSVS2+ρNVN2) we investigate the response of our system to the corresponding perturbation HI. We calculate the persistent current components JN(0) and JS(0) which exhibits the right behavior for T→0 and T→Tλ. © 1977 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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