Triplet Waves in a Quantum Spin Liquid

Guangyong Xu; C. Broholm; Daniel H. Reich; M. A. Adams

doi:10.1103/PhysRevLett.84.4465

Triplet Waves in a Quantum Spin Liquid

Strongly Correlated Electrons 2009-10-31 v2

Authors: Guangyong Xu , C. Broholm , Daniel H. Reich , M. A. Adams

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Abstract

We report a neutron scattering study of the spin-1/2 alternating bond antiferromagnet Cu(NO_3)_2. 2.5D_2O for 0.06<k_BT/J_1<1.5. For k_BT/J_1 << 1 the excitation spectrum is dominated by a coherent singlet-triplet mode centered at J_1=0.442(2) meV with sinusoidal dispersion and a bandwidth of J_2=0.106(2) meV. A complete description of the zero temperature contribution to the scattering function from this mode is provided by the Single Mode Approximation. At finite temperatures we observe exponentially activated band narrowing and damping. The relaxation rate is thermally activated and wave vector dependent with the period icity of the reciprocal lattice.

Keywords

spin excitations in condensed matter quantum spin liquids magnetic materials and spin systems

Cite

@article{arxiv.cond-mat/9908201,
  title  = {Triplet Waves in a Quantum Spin Liquid},
  author = {Guangyong Xu and C. Broholm and Daniel H. Reich and M. A. Adams},
  journal= {arXiv preprint arXiv:cond-mat/9908201},
  year   = {2009}
}

Comments

10 pages, 4 figures. Submitted to PRL 8/13/99. Minor chages in presentation

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