Shrinking stacking fault through glide of the Shockley partial dislocation in hard-sphere crystal under gravity

Abstract

Disappearance of a stacking fault in the hard-sphere crystal under gravity, such as reported by Zhuet al. [Nature 387, 883 (1997)], has successfully been demonstrated by Monte Carlo simulations. We previously found that a less ordered (or defective) crystal formed above a bottom ordered crystal under stepwise controlled gravity [Moriet al. J. Chem. Phys. 124, 174507 (2006)]. A defect in the upper defective region has been identified with a stacking fault for the (001) growth. We have looked at the shrinking of a stacking fault mediated by the motion of the Shockley partial dislocation; the Shockley partial dislocation terminating the lower end of the stacking fault glides. In addition, the presence of crystal strain, which cooperates with gravity to reduce stacking faults, has been observed.

Acknowledgement

The authors thank Professor B.B.Laird for reading the manuscript.

Notes

**By adjusting the lateral box size so as to remove the stress of the crystal the coexistence region has been corrected slightly, i.e. 0.494 < φ < 0.545 4. However, the result has not been affected; the stress cannot be removed entirely because the system is nonuniform and, in addition, the crystal can rotate aboutz axis