Local Structural and Electronic Changes Associated with the Bromination of YBCO: Charge Transfer and Cu-O Distortions

Author

• Lamine M. Dieng
• Trevor A. Tyson
• M. Croft
• Fatih Dogan, Missouri University of Science and TechnologyFollow
• Joseph Woicik
• James Grow

Abstract

In order to understand the role of bromination in the recovery of superconductivity and metallic transport in underdoped YBCO, we have measured the local structural changes in brominated single crystal samples and compared them with normal samples. From the c-axis polarized near edge x-ray absorption measurements, we see, for the first time, direct evidence for the transfer of hole density into the Cu(2)O2 planes in brominated samples. The corresponding XAFS measurements show large changes in the c-axis Cu-O bond distribution. Measurements of the local structure about Ba and Br were also performed. No evidence was found for the incorporation of Br onto the O(4) sites as previously suggested by some authors. We were able to model the coordination of Br and found it to be consistent with BaBr2 as suggested by Fukuda et al. [1] and Potrepka et al. [2].

Recommended Citation

L. M. Dieng et al., "Local Structural and Electronic Changes Associated with the Bromination of YBCO: Charge Transfer and Cu-O Distortions," APS March Meeting Abstracts, American Physical Society, Mar 2000.

Department(s)

Materials Science and Engineering

Comments

This work is supported by National Science Foundation Career Grant DMR-9733862.

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 American Physical Society, All rights reserved

Publication Date

2000-03-01