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
影响因子:
3.7
通讯作者:
Li Baowen
中科院分区:
文献类型:
--
作者:
Xi Qing;Zhang Zhongwei;Nakayama Tsuneyoshi;Chen Jie;Zhou Jun;Li Baowen
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.
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影响因子:
3.7
作者:
Xi Qing;Zhang Zhongwei;Chen Jie;Zhou Jun;Nakayama Tsuneyoshi;Li Baowen
通讯作者:
Li Baowen
影响因子:
3.7
作者:
Bentien, A;Christensen, M;Iversen, BB
通讯作者:
Iversen, BB
DOI:
10.1073/pnas.1410349111
发表时间:
2014-10-21
影响因子:
11.1
作者:
Qiu, Wujie;Xi, Lili;Zhang, Wenqing
通讯作者:
Zhang, Wenqing
DOI:
10.1088/1742-6596/500/18/182022
发表时间:
2014-05
期刊:
Journal of Physics: Conference Series
影响因子:
--
作者:
T. Sukemura;T. Kume;T. Matsuoka;S. Sasaki;T. Onimaru;T. Takabatake
通讯作者:
T. Sukemura;T. Kume;T. Matsuoka;S. Sasaki;T. Onimaru;T. Takabatake
影响因子:
3.7
作者:
Xiaojian Wang;Christopher D. Liman;N. Treat;M. Chabinyc;D. Cahill
通讯作者:
Xiaojian Wang;Christopher D. Liman;N. Treat;M. Chabinyc;D. Cahill