Talk:Cooper pair: Difference between revisions

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Copyright violation

This page appears to be copied completely from http://hyperphysics.phy-astr.gsu.edu/Hbase/solids/coop.html. According to the Copyright info on this page it's not allowed to just be copied, but the author seems open to licencing for educational purposes, which might include Wikipedia. Do we have permission, or does anyone feel like asking? --Apyule 06:54, 3 October 2006 (UTC)[reply]

Copyright violation resolved. Good catch! Nbishop 03:36, 17 October 2006 (UTC)[reply]

Densitiy of carriers

How can the electrons be 100 nm apart? Mercury is a metal. It has a lot electrons at the fermi energy. Arnero 21:40, 4 December 2006 (UTC)[reply]

There are a lot of electrons between two which form a cooper pair; the distance of 100-1000nm refers to the two electrons which form a pair. Even though it is hard to imagine, cooper pairs are a lot larger than the average distance between cooper pairs, or individual electrons for that matter. --Jonasbinding 12:41, 24 August 2007 (UTC)[reply]

Cooper paired electrons are only a small portion of the electrons at the fermi energy. The "sphere of influence" (or whatever you want to call it) of a cooper pair is 100nm-1000nm, but within that sphere there are many other (10^6?) other cooper pairs. (Their spheres overlap.) If you tried to find the location of the specific electrons comprising a given cooper pair, their "probability cloud" is large. —Preceding unsigned comment added by 205.250.252.133 (talk) 06:01, 2 June 2009 (UTC)[reply]

Comparison

How is this binding related to Covalent bond or Van der Waals forces ? Arnero 21:40, 4 December 2006 (UTC)[reply]

Covalent and VdW bonds refer to how electrons bind atoms together. A cooper pair refers to how Phonons bind two electrons together, which would otherwise move relatively free inside a metal. --Jonasbinding 12:41, 24 August 2007 (UTC)[reply]

Simplification?

Does the following phrase really belong in a section called "A simplified explanation"?

"...consider that many quasiparticles are more localized in K-space than in the usual space."

Orphan line?

What does "The pair are still Cooperic if k1 = k2 and k1 − q = − (k1 − q) = − ( − k2 − q) = − (k2 + q)" mean? This is the only time that those letters are used - it feels like this is an orphan from a previous edit. Alec.brady 09:42, 7 June 2007 (UTC)[reply]

Looking at the history, it's not left from an old edit, but it does feel like an orphan line and doesn't fit into the article. k1 and k2 presumably refer to the wave vectors of the electrons, q to a phonon they exchange (standard notation); but I'm not familiar with the statement itself, so I don't feel capable of improving it. I'd take it out; it's certainly a rather special case which doesn't fit the rest of the article. --Jonasbinding 12:41, 24 August 2007 (UTC)[reply]

I came here to ask about this. Apparently it has been here for more than two years. 72.75.67.226 (talk) 09:55, 6 October 2009 (UTC)[reply]

Removed article "Cooper electron pair"

I've removed the article "Cooper electron pair", on the grounds that it's a duplicate of this article and has had a merge tag on it for over a year! The content of that article was as follows:

A Cooper (electron) pair is a quasi-bound state of a pair of two electrons in a superconducting material. The composite entity behaves as a particle, with zero spin and charge twice that of an electron. Cooper pairs carry the current in a superconductor. This effect is most known concerning superconductivity.

A Cooper pair can form in a metal at low temperature. Despite the fact that the electrons Coulomb-repel each other, it may be possible to get an overall attractive force between the two. This is commonly explained in terms of an indirect coupling between the electrons, mediated by the lattice of positive ions.

Cooper pairs are an integral part of the theory of low-temperature superconductors, BCS theory.

I don't think there's any additional information in this text that isn't already in the Cooper pair article, but others' views would be useful here. I wonder whether the first sentence or two would make a better (well, simpler for the non-expert reader) introduction to the Cooper pair article than what's currently used. Djr32 (talk) 22:06, 8 November 2008 (UTC)[reply]

Good job deleting the duplicate article, looks completely redundant to me. I agree something like the first paragraph (excluding the awkward last sentence) would make a better lead-in for nontechnical readers than what's there now. Go ahead. --Chetvorno^TALK 00:56, 9 November 2008 (UTC)[reply]

@@ Line 29: / Line 29: @@
 Looking at the history, it's not left from an old edit, but it does feel like an orphan line and doesn't fit into the article. k1 and k2 presumably refer to the wave vectors of the electrons, q to a phonon they exchange (standard notation); but I'm not familiar with the statement itself, so I don't feel capable of improving it. I'd take it out; it's certainly a rather special case which doesn't fit the rest of the article. --[[User:Jonasbinding|Jonasbinding]] 12:41, 24 August 2007 (UTC)
+:I came here to ask about this.  Apparently it has been here for more than two years. [[Special:Contributions/72.75.67.226|72.75.67.226]] ([[User talk:72.75.67.226|talk]]) 09:55, 6 October 2009 (UTC)
 == Removed article "Cooper electron pair" ==