Structural disorder and the origin of high-Tc suppression in La1.875Ba0.125CuO4−δ

Author

• Daniel Haskins
• Edward A. Sterns
• Fatih Dogan, Missouri University of Science and TechnologyFollow
• Arnie R. Moodenbaugh

Abstract

Polarized x-ray absorption fine structure (XAFS) measurements at all La, Ba and Cu sites were used to study local structural features that accompany the strong T_c suppression at x ~ 1/8 in La_2-xBa_xCuO₄. Two critical parameters regulating the strength of hole-lattice coupling in this material were determined, i.e., the di- rection and magnitude of CuO₆ octahedra local tilts. Our findings include the existence of large disorder in the magnitude of the tilt angle about its average value < 0>, with a rms (formula presented) ≈2< 0>. We suggest that this large disorder strongly scatters a large fraction of states at the Fermi surface for x ~ 1/8 leading to the observed T_c suppression.

Recommended Citation

D. Haskins et al., "Structural disorder and the origin of high-Tc suppression in La1.875Ba0.125CuO4−δ," Journal of Synchrotron Radiation, vol. 6, no. 3, pp. 755 - 757, International Union of Crystallography, May 1999.

The definitive version is available at https://doi.org/10.1107/S0909049599001478

Department(s)

Materials Science and Engineering

Keywords and Phrases

Superconductivity; Barium doping; Mobility gap

International Standard Serial Number (ISSN)

0909-0495

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 International Union of Crystallography, All rights reserved

Publication Date

1999-05-01