
TY  - JOUR
A1  - Fisher, JC 
T1  - Alternative Superconducting Ground States
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1960
VL  - 13
IS  - 2
SP  - 446
EP  - 450
KW  - 
UR  - https://doi.org/10.1071/PH600446A 
N2  - A comparison is made between (a) the trial ground state composed of a linear combination of normal state configurations in which individual electron states of opposite momentum and equal spin projection (k t, -k t) and (k t, -k t), abbreviated (kcr, -kcr), are both either occupied or unoccupied, and (b) the trial ground state with (k t , -k t ) pairing proposed by Bardeen, Cooper, and Schrieffer. The two trial states lead to identical thermodynamics as long as an average matrix element -V = < Vkle' >av is treated as a disposable parameter. They lead to similar coherence effects for ultrasonic attenuation and nuclear spin relaxation. They differ in that spin paramagnetism is predicted for (kcr, -kcr) pairing. Detailed knowledge of the electron-phonon interaction in superconductors seems at present inadequate to rule out either possibility for all superconductors. 
ER  -

