Talk:BCS theory

message: The BCS theory page has an intuitive explanation of how Cooper pairs are formed (see below). I think this picture is not suitable, as it is wrong.
Cooper pairs are formed between electrons with opposite spin, and opposite k-vector. This means they have to be travelling in opposite directions! The energy of such a system is lowered compared to the two separate systems, because the center of mass is at rest.
:It's not really true. Cooper pars can be formed between electrons with same spin, but formation of such pair has very small probability. Andrius.v (talk) 10:40, 18 January 2009 (UTC)
thread_title:  Intuitive picture is wrong (?) 

message: There is a section dedicated to the successes of BCS theory, but none describing its shortcomings. It seems that the article would be more balanced if such a section were introduced. I currently do not have the expertise to write such an addition. Could anyone else give it a start?
zipz0p (talk) 00:58, 16 March 2009 (UTC)
thread_title:  Suggested material 

message: I've added a  to "In its simplest form, BCS gives the superconducting transition temperature in terms of the electron-phonon coupling potential and the Debye cutoff energy". I don't think that a link to the unit debye is correct, but am not sure what the right target would be. Maybe Debye frequency?--ospalh (talk) 12:04, 8 July 2010 (UTC)
replies: text: Debye temperature? Modest Genius talk 23:40, 10 January 2011 (UTC)
replies: text:  Debye frequency seems more likely ? relates to the max phonon energy ? - Rod57 (talk) 18:31, 31 August 2019 (UTC)
thread_title:  Debye 

message: I've removed the reference to the alternative theory developed by I.M. Yurin. Although it does cite one paper, that paper does not seem to be widely accepted, and does not meet the standards for inclusion here.  All other references I have found to Yurin's theory are posted by the author himself, who appears to have a bit of an axe to grind.  Until there's more secondary sources referring to this theory, I don't think it warrants inclusion here. PianoDan (talk) 19:10, 18 November 2012 (UTC)
thread_title:  Yurin's paper 

message: I am correcting the asymptotic versions of the gap equation near T=0 and near T=Tc, which appear to be wrong. I have no idea whether or not the references afterward remain valid, but would appreciate it if someone wants to check them out. Csmallw (talk) 19:05, 26 March 2014 (UTC)
thread_title:  BCS Gap Equation 

message: Other articles say this and need a source yet it is not clearly covered here. Who/when made the prediction from BCS that the max Tc would be about 30 K ? - Rod57 (talk) 19:09, 21 December 2015 (UTC)
replies: text: This is pre-1980s activity. Way outdated.--Ymblanter (talk) 19:23, 21 December 2015 (UTC)
replies: text: Maybe so, but it should be covered eg in a history section, and say when/how/who showed it to be an incorrect prediction. - Rod57 (talk) 13:22, 16 February 2016 (UTC)
thread_title:  Should mention that BCS used to predict max Tc of 30 K 

message: Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system. Sept 2015  says " the Bardeen–Cooper–Schrieffer theory of conventional superconductivity gives a guide for achieving high Tc with no theoretical upper bound — all that is needed is a favourable combination of high-frequency phonons, strong electron–phonon coupling, and a high density of states[4]".  - Rod57 (talk) 13:22, 16 February 2016 (UTC)
thread_title:  BCS theory motivated testing hydrogen sulphide under pressure 

message: An exponential rise in heat capacity near the critical temperature for some superconductors
What does "exponential" mean to this writer? "Big"? How can you observe exponential increase of a function f(t) as t approaches a finite value a? 
188.154.140.131 (talk) 10:45, 7 September 2018 (UTC)
thread_title:  Nonscientific language