P. Johansson et M. Altarelli, THEORY OF INELASTIC X-RAY-SCATTERING IN LAYERED SUPERCONDUCTORS, Physical review. B, Condensed matter, 53(13), 1996, pp. 8726-8732
This paper gives a theoretical treatment of inelastic x-ray scattering
off a layered superconductor. We calculate the scattering probability
for different gap symmetries (s and d(x2-y2)) The results show that s
uch an experiment in principle can give an indication as to the symmet
ry of the gap. In the case of s-wave symmetry and a nearly perfectly n
ested Fermi surface, we find that final-state interactions enhance the
scattering rate at threshold (h) over bar omega=2 Delta. The absolute
magnitudes of the scattering rates are, however, rather small. Our re
sults indicate that some further development of the synchrotron light
sources most likely is needed before this kind of experiment becomes f
easible.