Neutron scattering measurements of spin excitations in the spin ladder compound (pip)$_2$CuBr$_4$*

ORAL

Abstract

Recent theoretical and experimental work on S=1/2 ladders has been inspired, in part, by the realization of a novel quantum spin liquid state. Bulk magnetization measurements indicate that (C$_5$H$_{12}$N)$_2$CuBr$_4$ (BPCB) is a two-leg spin ladder with stronger coupling along the rung ($J_\bot$) than along the leg direction ($J_\|$) [1]. Here we report neutron spectroscopy measurements performed on a deuterated BPCB. We show that $J_\bot$ and $J_\|$ are consistent with the previous measurements. No dispersion in the inter-ladder direction means that the ladders are magnetically isolated, likely due to frustrated inter-ladder exchange. We show that any diagonal exchange is $

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Authors

  • A.T. Savici

  • C.L. Broholm

    • Dept. of Physics and Astronomy, Johns Hopkins Univ., Baltimore, MD

  • G.E. Granroth

  • S.E. Nagler

    • NSSD, ORNL, Oak Ridge, TN

  • K.P. Schmidt

  • G.S. Uhrig

    • Technische Univ. Dortmund, Dortmund, Germany

  • D.M. Pajerowski

  • M.W. Meisel

    • Dept. of Physics, Univ. of Florida, Gainesville, FL

  • D.R. Talham

    • Dept. of Chemistry, Univ. of Florida, Gainesville, FL

  • C.M. Brown

    • NIST Center for Neutron Research, Gaithersburg, MD