Local phonon mode in thermoelectric Bi2Te2Se from charge neutral antisites

Yao Tian, Gavin B. Osterhoudt, Shuang Jia, R. J. Cava, Kenneth S. Burch

Research output: Contribution to journalArticle

15 Scopus citations

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.

Original languageEnglish (US)
Article number041911
JournalApplied Physics Letters
Volume108
Issue number4
DOIs
StatePublished - Jan 25 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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