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-   -   microscopic theory of superconductivity (http://www.physicsforums.com/showthread.php?t=312257)

welatiger May6-09 02:49 PM

microscopic theory of superconductivity
 
hello everybody
i want informational about microscopic theory of superconductivity but without sophisticated quantum mechanics
can you help me ?

granpa May7-09 02:56 AM

Re: Superconductivity
 
the electrons form 'cooper pairs'. somehow that results in virtually zero resistance

bpsbps May7-09 09:44 AM

Re: Superconductivity
 
Not virtually zero, but actually zero resistance.

The Cooper pair is a quasiparticle. Unlike the two electrons inside it, the Cooper pair is a Boson, not a Fermion. Therefore the Cooper pair is not limited by the Pauli exclusion principle and all the Cooper pair are in the ground state (lowest quantum numbers).

In the case of a free electron (Fermion) conductivity requires electrons to be in excited states because they are above the Fermi energy so scattering of the excited electrons drops them back into the ground state. For the Boson there is no such scattering process.

Vanadium 50 May7-09 11:28 AM

Re: Superconductivity
 
Quote:

Quote by welatiger (Post 2187751)
hello everybody
i want informational about microscopic theory of superconductivity but without sophisticated quantum mechanics
can you help me ?

No. The microscopic theory requires "sophisticated quantum mechanics". This is fundamentally a quantum mechanical process.

granpa May7-09 05:48 PM

Re: Superconductivity
 
do the cooper pairs form a degenerate gas?

granpa May7-09 11:09 PM

Re: Superconductivity
 
http://www.absoluteastronomy.com/topics/Electron_pair

note the connection with diamagnetism

http://www.absoluteastronomy.com/topics/Lone_pair


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