科研之友
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摘要
The critical BEC temperature T (c) of a non interacting boson gas in a layered structure like those of cuprate superconductors is shown to have a minimum T (c,m) , at a characteristic separation between planes a (m) . It is shown that for a < a (m) , T (c) increases monotonically back up to the ideal Bose gas T (0) suggesting that a reduction in the separation between planes, as happens when one increases the pressure in a cuprate, leads to an increase in the critical temperature. For finite plane separation and penetrability the specific heat as a function of temperature shows two novel crests connected by a valley in addition to the well-known BEC peak at T (c) associated with the 3D behavior of the gas. For completely impenetrable planes the model reduces to many disconnected infinite slabs for which just one hump survives becoming a peak only when the slab widths are infinite.
- 出版日期2010-6
