In reply to [EMAIL PROTECTED]'s message of Wed, 27 Feb 2008 11:39:41 EST: Hi Frank, [snip] >>BTW, did you notice the "Fermi velocity"? [snip]
>The Fermi velocities are quite high. I was struck by how close the Fermi velocity is to your MHz-m, and wondered if there might be a connection? [snip] >I not sure of the >velocity distribution in a superconductive band. > >As far as the coherience lenght goes, there are may ways of looking at this. > We can look at the individual >pairs of electrons, as you do. I tend to look at the entire condensed >state. In this state the electrons are >Indistinguishable. They are part of the whole collective state. It the >ground frequency of this collective state is what I am interested in. I suspect that the velocities will be different depending on your point of view. If one looks at individual electrons, then one is looking at the speed of that electron, however when looking at the collective state, one is perhaps looking at the speed of signal transmission within the collective. > >I would also like to know the velocity distribution of the protons in a >proton conductor. I believe that they travel at low thermal velocities. >These >could also act as a plasma with the velocity proportionate to >The density of the state. There is another velocity possible in these systems too, and that is the average velocity when tunneling is the means of transport, or is this the signal velocity? > >The velocity of the state should not affect the strength of the phonons that >bind the state. This binding >force is not a function of the deBroglie wavelength. It is a function of >spin pairing. I'm not sure of all of the parameters involved with spin >pairing. > Cooling lowers the momentum MV of the electrons. I think some of the confusion arises from a lack of clarity in exactly what is cohering. [snip] >I need to know much more about these things. [snip] Me too. Regards, Robin van Spaandonk The shrub is a plant.
