Extended universal finite-T renormalization of excitations in a class of one-dimensional quantum magnets.
Extended universal finite-T renormalization of excitations in a class of one-dimensional quantum magnets.
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DOI：
10.1103/physrevlett.100.157204
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发表时间：
2007-11
影响因子：
8.6
通讯作者：
A. Zheludev;V. Garlea;L. Regnault;H. Manaka;A. Tsvelik;Jaiho Chung
中科院分区：
文献类型：
--
作者：
A. Zheludev;V. Garlea;L. Regnault;H. Manaka;A. Tsvelik;Jaiho Chung
用非弹性中子散射测量了准一维S=1/2带隙量子磁体（CH_3）（2）CHNH（3）CuCl（3）（IPA-CuCl（3），IPA表示异丙基铵）和Cu（2）Cl（4）·D（8）C（4）SO（2）（Sul-Cu（2）Cl（4））的带隙能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模型的理论计算进行了比较。结果发现，当T=0的能隙Δ被用作温度标度，所有的实验和理论曲线是相同的系统相关的，但温度无关的单位数量级的标度因子内。这种准普适性延伸到一个令人惊讶的广泛的T范围内，至少高达约1.5 Δ kappaT。
Temperature dependencies of gap energies and magnon lifetimes are measured in the quasi-one-dimensional S=1/2 gapped quantum magnets (CH3)(2)CHNH(3)CuCL(3) (IPA-CuCl(3), where IPA denotes isopropyl ammonium) and Cu(2)Cl(4).D(8)C(4)SO(2) (Sul-Cu(2)Cl(4)) 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 nonlinear 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 kappaT approximately 1.5 Delta.