Hi Prof Simon,
There's a question that comes up a lot regarding "What limits the actual lowest temperature you can achieve using adiabatic magnetic refrigeration", would it be the fact that as you try to lower the temperature with all the spins in configuration set by the initial magnetisation, you wouldn't be at the zero temperature state where you should have an equal number of spin up and spin down electrons? Or is it to do with the fact that the spin statistics become important at low temperature for electrons and hence why (as you say in the footnote) you have to rely on the nuclear spins which are "independent" to a better approximation than the electrons, so it's the nuclear magnetic moments of your atoms that sets the limit of adiabatic cooling?
Also, thanks for all your help on these message boards, it's been really useful.
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