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arXiv 1302.4867cond-mat.str-elcond-mat.other
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二维和三维反铁磁振子的寿命:实验、理论和数值计算

Lifetimes of antiferromagnetic magnons in two and three dimensions: experiment, theory, and numerics

S. P. Bayrakci, D. A. Tennant, Ph. Leininger, T. Keller, M. C. R. Gibson, S. D. Wilson, R. J. Birgeneau, B. Keimer

摘要:

一个高分辨率的中子光谱技术被用来测量动量分辨的磁振子寿命在原型的二维和三维反铁磁体Rb 2 MnF 4和MnF 2,在整个布里渊区和广泛的温度范围。我们重新推导的理论的寿命产生的磁振子-磁振子散射,从而扩大其适用范围以外的渐近小区域的波矢和温度。相应的计算,结合一个小的贡献,反映与域边界的碰撞,产生良好的定量协议的数据。

英文摘要:

A high-resolution neutron spectroscopic technique is used to measure momentum-resolved magnon lifetimes in the prototypical two- and three-dimensional antiferromagnets Rb2MnF4 and MnF2, over the full Brillouin zone and a wide range of temperatures. We rederived theories of the lifetime resulting from magnon-magnon scattering, thereby broadening their applicability beyond asymptotically small regions of wavevector and temperature. Corresponding computations, combined with a small contribution reflecting collisions with domain boundaries, yield excellent quantitative agreement with the data.

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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