William Hinsberg, Joy Cheng, et al.
SPIE Advanced Lithography 2010
Sintered bulk samples of the orthorhombic, superconducting, phase of YBa2Cu3O7- exhibit a 1.5 eV Ba core-level decrease compared to the tetragonal, nonsuperconducting phase. This is also observed for thin-film material in the two phases. Using ab initio cluster calculations, we show that shifts of this magnitude are explainable by isotropic contraction of the Ba-O bond length in the 0.01- to 0.02- range, values compatible with the known lattice-parameter changes between the phases. Finally, even in situ cleaved good-quality single crystals of the orthorhombic phase show a chemically shifted Ba component for some regions of the surface, which may be due to Ba-O bond-length contractions at the surface-vacuum interface. © 1991 The American Physical Society.
William Hinsberg, Joy Cheng, et al.
SPIE Advanced Lithography 2010
Shaoning Yao, Wei-Tsu Tseng, et al.
ADMETA 2011
O.F. Schirmer, K.W. Blazey, et al.
Physical Review B
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989