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Can Fermions have 0 spin?
Generally, it has a half-odd-integer spin
....electrons can ... become a loosely-coupled spin 0 compound particle.... It seems, rather than defining the electron as a Fermion, they are saying that any particle that behaves like a Fermion is a Fermion (and if they stop behaving like Fermions, they are no longer Fermions).
If it looks like a duck, walks like a duck and quacks like a duck, then it just may be a duck
If it looks like a metallic conductor , it's probably a Fermi surface
If we take a metallic superconductor (like Al, Ga, Hg, Zn, etc), the metallic lustre at room temperature is provided by electrons in the Fermi surface.Once it becomes superconducting (at around 0.8-4K), I presume it retains its metallic lustre(?)- Is this because most electrons are still at the Fermi surface, while a small fraction form Cooper pairs, and are no longer at the Fermi surface?
If it looks like a metallic conductor , it's probably a Fermi surface.
...the metallic lustre at room temperature is provided by electrons in the Fermi surface....
Once.. [metal]... becomes superconducting (at around 0.8-4K), I presume it retains its metallic lustre(?)
Everything, well everything with electrons in it, should have a Fermi Surface.
electrons don't travel in straight lines but prefer to cycle around
In a magnetic field, moving electrons will cycle around the magnetic field lines
Magnetic fields do not penetrate a Type 1 superconductor
I assume for Fe or Co, the magnetic domains inside the material would affect the motion of electrons more than the Earth's magnetic field?
But I'm going to guess "no" and that the earths magentic field doesn't significantly cause spiralling either.
a recently heated and bashed lump of Iron has approx. 0 strength magnetic field over any finite length, at least until you get down to atomic lengths.
In most materials the domains are microscopic in size, around 10−4 - 10−6 m
In most materials the domains are... (bigger than atomic scales)