相互作用二聚体自旋系统的量子统计

Quantum statistics of interacting dimer spin systems.

作者信息

Rüegg Ch, Normand B, Matsumoto M, Niedermayer Ch, Furrer A, Krämer K W, Güdel H-U, Bourges Ph, Sidis Y, Mutka H

机构信息

London Centre for Nanotechnology, Department of Physics and Astronomy, University College London, UK.

出版信息

Phys Rev Lett. 2005 Dec 31;95(26):267201. doi: 10.1103/PhysRevLett.95.267201. Epub 2005 Dec 19.

DOI:10.1103/PhysRevLett.95.267201

PMID:16486391

Abstract

The compound TlCuCl(3) represents a model system of dimerized quantum spins with strong interdimer interactions. We investigate the triplet dispersion as a function of temperature by inelastic neutron scattering experiments on single crystals. By comparison with a number of theoretical approaches we demonstrate that the description of Troyer, Tsunetsugu, and Würtz [Phys. Rev. B 50, 13 515 (1994)10.1103/Phys. Rev. B 50, 13515] provides an appropriate quantum statistical model for dimer spin systems at finite temperatures, where many-body correlations become particularly important.

摘要

化合物TlCuCl(3)代表了具有强二聚体间相互作用的二聚化量子自旋的模型体系。我们通过对单晶进行非弹性中子散射实验来研究三重态色散随温度的变化。通过与多种理论方法进行比较，我们证明了Troyer、Tsunetsugu和Würtz [《物理评论B》50, 13515 (1994年)] 的描述为有限温度下的二聚体自旋体系提供了一个合适的量子统计模型，在该温度下多体关联变得尤为重要。