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arXiv 1701.01192cond-mat.mtrl-scicond-mat.dis-nn
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晶体中的类液体热传导

Liquid-like thermal conduction in a crystalline solid

B. Li, Y. Kawakita, Q. Zhang, H. Wang, M. Feygenson, H. L. Yu, D. Wu, K. Ohara, T. Kikuchi, K. Shibata, T. Yamada, Y. Chen, J. Q. He, D. Vaknin, R. Q. Wu, K. Na… 展开作者

B. Li, Y. Kawakita, Q. Zhang, H. Wang, M. Feygenson, H. L. Yu, D. Wu, K. Ohara, T. Kikuchi, K. Shibata, T. Yamada, Y. Chen, J. Q. He, D. Vaknin, R. Q. Wu, K. Nakajima, M. G. Kanatzidis

摘要:

固体通过横向和纵向声学声子传导热量,但液体仅利用纵向振动。在这里,我们报告说,晶体固体AgCrSe 2具有类似液体的热传导。在这种化合物中,Ag原子表现出动态的双重性,它们专门参与强烈的低横声学声子,同时它们也经历在450 K下发生的有序到无序转变中固有的局部波动。由于这种极端的无序-声子耦合,横向声学声子在接近转变温度时变得阻尼,在该温度以上它们不再被定义,因为它们的寿命比局部波动的弛豫时间短。然而,阻尼的纵向声学声子存活的热输运。这种微观的洞察力可能会重塑物质热传输特性的基本思想,并促进热电的优化。

英文摘要:

A solid conducts heat through both transverse and longitudinal acoustic phonons, but a liquid employs only longitudinal vibrations. Here, we report that the crystalline solid AgCrSe2 has liquid-like thermal conduction. In this compound, Ag atoms exhibit a dynamic duality that they are exclusively involved in intense low-lying transverse acoustic phonons while they also undergo local fluctuations inherent in an order-to-disorder transition occurring at 450 K. As a consequence of this extreme disorder-phonon coupling, transverse acoustic phonons become damped as approaching the transition temperature, above which they are not defined anymore because their lifetime is shorter than the relaxation time of local fluctuations. Nevertheless, the damped longitudinal acoustic phonon survives for thermal transport. This microscopic insight might reshape the fundamental idea on thermal transport properties of matter and facilitates the optimization of thermoelectrics.

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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