Date of this Version
Physical Review Letters
X-ray diffraction and calorimetry data on cubic NaxC60(1<xTm above that of pure C60, e.g., Tm(x=1.3)=325 K. The ordered phases are the same as in pure C60: simple cubic, space group Pa3¯, but the orientations in the disordered phase are more restricted. We explain how Na stabilizes the ordered phase to rather high T, while K and Rb do not, in terms of Coulomb interactions between C60 molecules and and Na ions which we calculate from the local density approximation charge density of C60.
Yildirim, T., Fischer, J. E., Harris, A., Stephens, P. W., Liu, D., Brard, L., Strongin, R. M., & Smith, A. B. (1993). Orientational Phase Transition in NaxC60 (1 < x < 3). Physical Review Letters, 71 (9), 1383-1386. http://dx.doi.org/10.1103/PhysRevLett.71.1383
Date Posted: 20 August 2015
This document has been peer reviewed.