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Incommensurate dynamic correlations in the quasi-two-dimensional spin liquid BiCu_2PO_6

机译:准二维自旋液体BiCu_2PO_6中的动力学不相关

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摘要

We report detailed inelastic neutron-scattering measurements on single crystals of the frustrated two-leg ladder BiCu_2PO_6, whose ground state is described as a spin liquid phase with no long-range order down to 6 K. Two branches of steeply dispersing long-lived spin excitations are observed with excitation gaps of △_1 = 1.90(9) meV and △_2 = 3.95(8) meV. Significant frustrating next-nearest-neighbor interactions along the ladder leg drive the minimum of each excitation branch to incommensurate wave vectors ζ_1 = 0.574π and ζ_2 = 0.553π for the lower and upper energy branches, respectively. The temperature dependence of the excitation spectrum near the gap energy is consistent with thermal activation into singly and doubly degenerate excited states. The observed magnetic excitation spectrum as well as earlier thermodynamic data could be consistently explained by the presence of strong anisotropic interactions in the ground-state Hamiltonian.
机译:我们报告了对受挫的两腿阶梯BiCu_2PO_6的单晶进行的详细非弹性中子散射测量,BiCu_2PO_6的基态被描述为自旋液相,没有低至6 K的长程有序。陡峭分散的长寿命自旋的两个分支以△_1 = 1.90(9)meV和△_2 = 3.95(8)meV的激发间隙观察到激发。沿着梯子腿的令人沮丧的次近邻相互作用将每个激励分支的最小值分别驱动为上下能量分支的不等波矢量ζ_1=0.574π和ζ_2=0.553π。接近能隙的激发光谱的温度依赖性与热激活成单次和双次简并的激发态相一致。基态哈密顿量中存在强烈的各向异性相互作用,可以一致地解释观测到的磁激发光谱以及较早的热力学数据。

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  • 来源
    《Physical review》 |2013年第2期|024402.1-024402.8|共8页
  • 作者单位

    Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada;

    Canadian Neutron Beam Centre, National Research Council, Chalk River Laboratories, Chalk River, Ontario K0J 1PO, Canada;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan;

    Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantized spin models; dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.);

    机译:量化自旋模型动态特性(动态磁化率;自旋波;自旋扩散;动态缩放等);

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