|Feb25-12, 08:26 PM||#1|
Super-fluid 4He - (two domains)
Hi PF ,
I am making a review article which is mainly based on low temperature physics , upon going through my search I have stumbled across the famous " Lambda transition" of super liquid helium. Paraphrasing what some of the books said : " In the He II domain a percentage of atoms in same quantum state act as a single entity , while the rest of the percentage is made up of atoms which have different quantum states ( another book says normal , what do they mean by normal ? vector [position ?] , the overall density stays constant " .
I need bit of a clarification on the bold bit , also it's said that as the temperature is dropped to absolute zero , the number of atoms ( normal) decreases.
I know that in Q.M particles are said to obey einstein-bose statistics if they have an integer spin of zero , so in what way is He II similar to Bose- Einstein condensate.
I appreciate your help.
|Feb28-12, 02:26 PM||#2|
You need to check the two fluid model for superfluids. Here is one link I got from Google
Normal fluid represents the non-superfluid part. Nothing to do with vectors.
He-II is a BEC because all of the He atom are in the ground state and can be described by a single wave function.
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