摘要翻译:
我们测量了几何受挫焦绿石海森堡反铁磁体Gd2Sn2O7在零磁场中的低温比热。发现比热在大约350兆克以下呈指数下降。这为单离子效应和长程偶极相互作用引起的各向异性所导致的自旋波谱的间隙提供了证据。线性自旋波理论很好地拟合了这些数据,排除了该体系中非常规的低能磁激励,并允许确定该材料中相关的交换相互作用。
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英文标题:
《Evidence for gapped spin-wave excitations in the frustrated Gd2Sn2O7
pyrochlore antiferromagnet from low-temperature specific heat measurements》
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作者:
J.A. Quilliam, K.A. Ross, A.G. Del Maestro, M.J.P. Gingras, L.R.
Corruccini, J.B. Kycia
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
We have measured the low-temperature specific heat of the geometrically frustrated pyrochlore Heisenberg antiferromagnet Gd2Sn2O7 in zero magnetic field. The specific heat is found to drop exponentially below approximately 350 mK. This provides evidence for a gapped spin-wave spectrum due to an anisotropy resulting from single ion effects and long-range dipolar interactions. The data are well fitted by linear spin-wave theory, ruling out unconventional low energy magnetic excitations in this system, and allowing a determination of the pertinent exchange interactions in this material.
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PDF链接:
https://arxiv.org/pdf/707.2072