2002 年 29 巻 2 号 p. 119-
Oxide superconductor YBa_2Cu_3O_6 has two dimensional structure and is interesting in crystal habit and surface morphology. The α-factors of (001) and (100) were 20 and 15-18, attributing to the difference of the surface morphology. Assumption that step advancing velocity_ is proportional to the summation of attachment energies of faces consisting the step conclude isometric shape of the crystal.