arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1305.6853cond-mat.str-el
收藏

Tb_2Ti_2O_7单晶的类磁致声子玻璃行为

Magnetically originated phonon-glass-like behavior in Tb_2Ti_2O_7 single crystal

Q. J. Li, Z. Y. Zhao, C. Fan, F. B. Zhang, H. D. Zhou, X. Zhao, X. F. Sun

摘要:

本文研究了Tb_2Ti_2O_7单晶的低温热导率(κ)。结果表明,该材料在零场条件下,在很宽的温度范围内具有极低的声子热导率。声子的平均自由程甚至比非晶材料的小,在0.3K时比样品尺寸小3- 4个数量级。讨论了自旋液体态的强自旋涨落是产生强声子散射的原因。通过与Y_2Ti_2O_7和TbYTi_2O_7的比较,证实了这种声子玻璃行为的磁性起源。

英文摘要:

We report a study on the thermal conductivity (κ) of Tb_2Ti_2O_7 single crystals at low temperatures. It is found that in zero field this material has an extremely low phonon thermal conductivity in a broad temperature range. The mean free path of phonons is even smaller than that of amorphous materials and is 3--4 orders of magnitude smaller than the sample size at 0.3 K. The strong spin fluctuation of the spin-liquid state is discussed to be the reason of the strong phonon scattering. The magnetic-field dependence of κand comparison with Y_2Ti_2O_7 and TbYTi_2O_7 confirm the magnetic origin of this phonon-glass-like behavior.

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。

↑