M. Kraus et al., Structural influence on the intensitiy ratio of the T ' and T Rb-87 NMR lines and the superconductivity in Rb3C60, MOLEC CRYST, 340, 2000, pp. 593-598
The intensity ratio of the T'/T Rb-87 NMR lines in Rb3C60 could be changed
by different cooling rates after annealing at 380 degrees C. The results ar
e discussed with respect to magnetically different surroundings of the Rb i
ons through the two standard orientations of the C(60)(3-)ions. Additionall
y, the superconducting volume fraction is influenced by the different cooli
ng procedures.