Off-center rattling triggers high-temperature thermal transport in thermoelectric clathrates: Nonperturbative approach

Off-center rattling triggers high-temperature thermal transport in thermoelectric clathrates: Nonperturbative approach
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偏心嘎嘎声触发热电包合物中的高温热传输:非微扰方法

DOI:
10.1103/physrevb.97.224308
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发表时间:
2018-06
期刊:
影响因子:
3.7
通讯作者:
Li Baowen
Li Baowen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xi Qing;Zhang Zhongwei;Nakayama Tsuneyoshi;Chen Jie;Zhou Jun;Li Baowen

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包裹“偏心”客体原子的I型包合物的晶格热导率与传统晶体(如中心I型包合物)的热导率有很大的不同。后者在几十K以上随温度的升高而减小,而偏心包合物L的偏心包合物在几十K以上呈T线性增长,在100K以上进一步升高,L饱和而不表现出明显的T依赖关系。在这个温度范围内,基于微扰理论的标准公式是不可行的。本文提出了一种基于“非微扰”方法的L理论,该理论考虑了客体原子的非振动偏心拍击态与笼壳的相互作用。值得注意的是,对于偏心包合物的大小、笼子体积和T依赖关系,我们的理论与观察到的kappa{rM L}(T)$表现出很好的一致性。
Lattice thermal conductivities $\kappa_{\rm L}$ of type-I clathrates encapsulating "off-center" guest atoms behave in a way that is sharply different from those of conventional crystals such as on-center type-I clathrates. The latter decreases with increasing temperature according to 1/$T$ above a few tens\,K. While, $\kappa_{\rm L}$ of off-center clathrates increase T-linearly above a few tens K. Further increasing temperature above $T\gtrsim$100 K, $\kappa_{\rm L}$ saturates without exhibiting appreciable T-dependence. In this temperature regime, the standard formulation of $\kappa_{\rm L}$ based on the perturbation theory is unfeasible. We herein present a theory of $\kappa_{\rm L}$ based on "non-perturbative" approach by taking into account the interaction between non-vibrational off-center rattling states of guest atoms and cage shells. It is remarkable that our theory shows excellent agreement with observed $\kappa_{\rm L}(T)$ for off-center clathrates in magnitudes, the cage volume $\Omega$-dependence and T-dependence.
跳跃过程解释了具有偏心客体原子的热电包合物中热导率温度的线性上升
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