|Table of Contents|
[1].Germanium isotope effect induced guest rattling and cage distortion in clathrates[J].Journal of Materiomics,2018,(04):338-344.[doi:https://doi.org/10.1016/j.jmat.2018.08.003]
 Ran Anga,b,Zhengshang Wanga,et al.Germanium isotope effect induced guest rattling and cage distortion in clathrates[J].Journal of Materiomics,2018,(04):338-344.[doi:https://doi.org/10.1016/j.jmat.2018.08.003]
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Journal of Materiomics[ISSN:/CN:]

volumne:
Issue:
2018年04期
Page:
338-344
Research Field:
Publishing date:
2018-11-22

Info

Title:
Germanium isotope effect induced guest rattling and cage distortion in clathrates
Highlights:
Ran AngabZhengshang WangaShang-Fei WucPierre RichardcdeZhenzhong YangcLin GucdGang MufJingtao XugNing LiuaJun Tangab
aKey Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, China; bInstitute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610065, China; cInstitute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; dCollaborative Innovation Center of Quantum Matter, Beijing, 100190, China; eSchool of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China; fState Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China; gNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
Keywords:
ThermoelectricClathrateIsotope effectElectron-phonon coupling
PACS:
-
DOI:
https://doi.org/10.1016/j.jmat.2018.08.003
Abstract:
Intermetallic clathrates are materials characterized by a large cage structure where guest atoms can move anharmonically, providing these materials exotic thermoelectric properties. Unfortunately, the dynamical and atomic nature of the rattling phonons, and their interactions with the electronic structure, are not fully understood. Here, we report that a germanium isotope effect can trigger an inherent guest rattling and cage distortion in clathrate Ba8Ga16Ge30 (BGG). Raman-scattering spectroscopy and advanced electron microscopy demonstrate that the atomic germanium isotope effect induces an off-centre rattling at the 6d sites as well as a tetrakaidecahedron deformation which is anisotropic for n-type BGG but isotropic for p-type BGG. The present findings indicate that the large n-type germanium isotope effect arises from the strong electron-phonon coupling, which opens up a novel avenue for manipulating dynamical motions of phonons via atomic isotope engineering.

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Last Update: 2018-11-22