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Understanding the evolution of anomalous anharmonicity in Bi2 Te3-x Sex

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [3];  [3];  [4]
  1. Univ. of Toronto, ON (Canada). Dept. of Physics & Inst. of Optical Sciences
  2. Princeton Univ., NJ (United States). Dept. of Chemistry
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  4. Boston College, Chestnut Hill, MA (United States). Dept. of Physics
The anharmonic effect in thermoelectrics has been a central topic for decades in both condensed matter physics and material science. However, despite the long-believed strong and complex anharmonicity in the Bi2Te3-xSex series, experimental verification of anharmonicity and its evolution with doping remains elusive. We fill this important gap with high-resolution, temperature-dependent Raman spectroscopy in high-quality single crystals of Bi2Te, Bi2Te2Se , and Bi2Se3 over the temperature range from 4 to 293 K. Klemens's model was employed to explain the renormalization of their phonon linewidths. The phonon energies of Bi2Se3 and Bi2Te3 are analyzed in detail from three aspects: lattice expansion, cubic anharmonicity, and quartic anharmonicity. For the first time, we explain the evolution of anharmonicity in various phonon modes and across the series. Lastly, in particular, we find that the interplay between cubic and quartic anharmonicity is governed by their distinct dependence on the phonon density of states, providing insights into anomalous anharmonicity designing of new thermoelectrics.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1372431
Report Number(s):
BNL--113904-2017-JA; KC0201060
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 9 Vol. 95; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Mode Grüneisen parameters of an efficient thermoelectric half-Heusler journal November 2018
Coherent phonons in a Bi 2 Se 3 film generated by an intense single-cycle THz pulse journal June 2018
Transition into a phonon glass in crystalline thermoelectric ( S b 1 − x B i x ) 2 T e 3 films journal February 2020
Mode Grüneisen parameters of an efficient thermoelectric half-Heusler text January 2018

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