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Local phonon mode in thermoelectric Bi 2 Te 2 Se from charge neutral antisites

Author(s): Tian, Yao; Osterhoudt, Gavin B.; Jia, Shuang; Cava, Robert Joseph; Burch, Kenneth S.

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Abstract: Local modes caused by defects play a significant role in the thermal transport properties of thermoelectrics. Of particular interest are charge-neutral defects that suppress thermal conductivity, without significantly reducing electrical transport. Here, we report a temperature dependent Raman study that identifies such a mode in a standard thermoelectric material, Bi2Te2Se. One of the modes observed, whose origin has been debated for decades, was shown most likely to be an antisite defect induced local mode. The anomalous temperature independent broadening of the local mode is ascribed to the random arrangement of Se atoms. The temperature renormalization of all modes is well explained by an anharmonic model-Klemens's model. © 2016 AIP Publishing LLC.
Publication Date: 25-Jan-2016
Electronic Publication Date: 28-Jan-2016
Citation: Tian, Yao, Osterhoudt, Gavin B., Jia, Shuang, Cava, R.J., Burch, Kenneth S. (2016). Local phonon mode in thermoelectric Bi 2 Te 2 Se from charge neutral antisites. Applied Physics Letters, 108 (4), 041911 - 041911. doi:10.1063/1.4941022
DOI: doi:10.1063/1.4941022
ISSN: 0003-6951
EISSN: 1077-3118
Pages: 041911-1 - 041911-6
Type of Material: Journal Article
Journal/Proceeding Title: Applied Physics Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Applied Physics Letters. Volume 108, Issue 4, 25 January 2016, Article number 041911.

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