STATISTICAL CORRELATIONS ON THE BIOSURFACE IN BI2SR2CACU2O8-X SINGLE-CRYSTALS

[摘要] Low temperature scanning tunneling microscope techniques are applied to study statistical properties of the BiO plane in 2212 high-T(c) single crystals. The correlation functions of height deviations in x and k-spaces have been numerically obtained. Long range power law correlations have been found and attributed to half lattice cell jumps of known height in the c direction. Analysis of the correlation function in k-space reveals two modulating superstructures in the b direction. The most pronounced structure is the well known superstructure with period a1 almost-equal-to 27 angstrom. The other one has period a2 almost-equal-to 58 angstrom which is a little more than twice the period of the main superstructure.

[发布日期] 1992-07-15