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arXiv 0711.4094cond-mat.str-el
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带隙一维量子磁体中的准普适有限$T$标度

Quasi-universal finite-$T$ scaling in gapped one-dimensional quantum magnets

A. Zheludev, V. O. Garlea, L. -P. Regnault, H. Manaka, A. Tsvelik, J. -H. Chung

摘要:

用非弹性中子散射测量了准一维S=1/2带隙量子磁体IPA-CuCl_3和Sul-Cu_2Cl_4的带隙能量和磁振子寿命随温度的变化。结果与文献中发现的S=1 Haldrons自旋链材料和O(3)-和O(N)-量子非线性σ模型的理论计算结果进行了比较。发现当T=0能隙Δ作为温标时,所有的实验和理论曲线都与系统相关但与温度无关的标度因子一致.这种准普遍性延伸到一个令人惊讶的广泛的T范围,至少高达kappa T ~ 1.5 Delta。

英文摘要:

Temperature dependencies of gap energies and magnon lifetimes are measured in the quasi-1-dimensional S=1/2 gapped quantum magnets IPA-CuCl3 and Sul-Cu2Cl4 using inelastic neutron scattering. The results are compared to those found in literature for S=1 Haldane spin chain materials and to theoretical calculations for the O(3)- and O(N)- quantum non-linear sigma-models. It is found that when the T=0 energy gap Delta is used as the temperature scale, all experimental and theoretical curves are identical to within system-dependent but temperature-independent scaling factors of the order of unity. This quasi-universality extends over a surprising broad T range, at least up to kappa T ~ 1.5 Delta.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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