M. Hargrove, S.W. Crowder, et al.
IEDM 1998
We report a detailed high-resolution, x-ray-scattering study of the commensurate-incommensurate transition of Kr on ZYX exfoliated graphite powder. As the Kr coverage is increased, the transition proceeds as follows: A sharp diffraction line from the commensurate phase drops in intensity and is replaced by a diffuse incommensurate line. The scattering from this disordered phase sharpens continuously as it moves to higher wave vector. We have followed this evolution up to 4 compression, where the line shape is adequately described by a power-law correlation function characteristic of two-dimensional solids. In one sample, there was a significant two-phase coexistence region which we ascribe to a distribution of critical points. We place an upper limit of 1 on the possible first-order jump. No evidence for a uniaxially compressed phase is seen. The weakly incommensurate diffraction line is accompanied by a satellite which may arise from either a domain-wall superlattice or a weak strain modulation of the overlayer. A detailed description of domain lattice models is presented. The loss of long-range order at the transition is discussed in the light of current theories. © 1984 The American Physical Society.
M. Hargrove, S.W. Crowder, et al.
IEDM 1998
Mark W. Dowley
Solid State Communications
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
Oliver Schilter, Alain Vaucher, et al.
Digital Discovery