|The superconducting states, corresponding to d(k)
d(k) = kx
(right), have different spin orientations and total angular momentum.
+ iky) state has
an angular momentum along the z-axis (thick arrow) and spin perpendicular
in the plane (thin arrows). Its total angular momentum therefore
has a value of 1 and points along the z-axis. The kx
state has vanishing total angular momentum because the orbital angular
momentum is compensated by the spins of the Cooper pair. Both states
represent equal-spin-pairing states, but have very different physical properties.
Experiments identify the superconducting phase in Sr2RuO4
as being of the type in the left panel--that is, a state with finite angular
© 2001 American Institute of Physics