Effect of oxgyen ordering on the spin dynamics of YBa$_2$Cu$_3$O$_{6.5}$

ORAL

Abstract

We use inelastic neutron scattering to study the oxgyen disorder effect in electronic properties of YBCO 6.5. Previous work have shown when copper oxgyen chains in the YBCO 6.5 form ortho-II order, magnetic excitations in YBCO6.5 form a resonance around 33 meV and incommensurate spin flucutations below the resonance. In oder to study oxygen disorder effect on spin excitations of YBCO 6.5, we measured spin dynamics of detwinned Ortho-I YBCO (x=6.5) ($T_c$=48K), whose Cu-O chains are not well ordered. We find that oxygen disorder can have dramatic effect on spin dynamics of YBCO6.5. We discuss similarities and differences in spin dynamics in these two materials and their possible interpretation.

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Authors

  • Shiliang Li

    University of Tennessee, University of Tennesse at Knoxville

  • Z. Yamani

    Chalk River Laboratories, Canada

  • Hye Jung Kang

    NIST Center for Neutron Research, NIST Center for Neutron Scattering, University of Tennessee, NIST, University of Maryland

  • F. Ye

    Oak Ridge National Laboratory

  • C. Bircher

    University of Tennessee

  • K. Segawa

    Central Research Institute of Electric Power Industry, Japan

  • Y. Ando

    Central Research Institute of Electric Power Industry, Japan

  • Xin Yao

    Shanghai Jiao Tong University, China

  • H. A. Mook

    Oak Ridge National Laboratory

  • Pengcheng Dai

    University of Tennessee/ Oak Ridge National Lab, University of Tennessee, The University of Tennessee, University of Tennesse at Knoxville