Fig. 2: Vacancy ordering and periodic lattice distortions induced in Cu-1234. | NPG Asia Materials

Fig. 2: Vacancy ordering and periodic lattice distortions induced in Cu-1234.

From: Atomic origin of the coexistence of high critical current density and high Tc in CuBa2Ca3Cu4O10+δ superconductors

Fig. 2

a Crystal structure of Cu-1234 with an a×2b×2c modulated structure. b, c Atomic resolved HAADF-STEM and ABF-STEM images of Cu-1234 taken along the [100] zone axis, respectively. The red and blue arrows illustrate the relatively bright and dark intensities of the Cu1bO1b column and Cu1aO1a column, respectively. Scale bar = 1 nm. d, e Atomic resolved HAADF-STEM and ABF-STEM images of Cu-1234 taken along the [010] zone axis, respectively. Scale bar = 1 nm. f Ba–Ba atomic column spacings along the in-plane (d1) and out-of-plane (d2) directions as a function of the relative distance between Cu sites. g O–Cu atomic column distance along the out-of-plane (d3) direction as a function of the relative distance of Cu sites.

Back to article page