Zooming-in on the charge ordering in YBa2Cu3O6.5
Feng, D. L. · Rusydi, A. · Abbamonte, P. · Venema, L. · Elfimov, I. · Liang, R. · Bonn, D. A. · Hardy, W. N. · Schusler-Langeheine, C. · Hulbert, S. · Kao, C. -C. · Sawatzky, G. A.
Original · EN
We report direct evidence of charge/orbital ordering of low energy electronic states of Cu in YBa₂Cu₃O₆₊ₓ ortho-II phase in both the CuO₃ chain and the CuO₂ plane. Huge enhancement of the (1/2,0,0) superstructure Bragg peak is observed when photon energy is tuned to the Cu L₂,₃ absorption edge with large polarization dependence. The ordering in the CuO₂ plane discovered here sheds new light on how the one dimensional Cu-O chains affect the CuO₂ plane, and why many normal and superconducting state properties of this system exhibit strong anisotropy.
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