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arXiv 1004.2373cond-mat.str-el
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Heat capacity揭示了受挫折的自旋管的物理学

Heat capacity uncovers physics of a frustrated spin tube

N. B. Ivanov, J. Schnack, R. Schnalle, J. Richter, P. Koegerler, G. N. Newton, L. Cronin, Y. Oshima, Hiroyuki Nojiri

摘要:

我们报告精炼的实验结果有关的低温比热的挫折自旋管材料[(CuCl 2 tachH)3Cl] Cl 2。这种物质被证明是一个非常完美的自旋管系统,可以在相当一般的条件下研究准一维反铁磁结构的物理学。比热数据的分析表明,在足够低的温度下,该系统表现出Tomonaga-Luttinger液体行为对应于一个有效的自旋3/2反铁磁海森堡链与短程交换相互作用。另一方面,在稍微升高的温度下,链的复合自旋结构通过位于2K附近的比热中的肖特基型峰显示。我们认为,占主导地位的贡献峰起源于有间隙的磁振子型激发有关的内部自由度的梯级自旋。

英文摘要:

We report on refined experimental results concerning the low-temperature specific heat of the frustrated spin tube material [(CuCl2tachH)3Cl]Cl2. This substance turns out to be an unusually perfect spin tube system which allows to study the physics of quasi-one dimensional antiferromagnetic structures in rather general terms. An analysis of the specific heat data demonstrates that at low enough temperatures the system exhibits a Tomonaga-Luttinger liquid behavior corresponding to an effective spin-3/2 antiferromagnetic Heisenberg chain with short-range exchange interactions. On the other hand, at somewhat elevated temperatures the composite spin structure of the chain is revealed through a Schottky-type peak in the specific heat located around 2 K. We argue that the dominating contribution to the peak originates from gapped magnon-type excitations related to the internal degrees of freedom of the rung spins.

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