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Title: Unusual electronic and vibrational properties in the colossal thermopower material FeSb2

Abstract

The iron antimonide FeSb 2 possesses an extraordinarily high thermoelectric power factor at low temperature, making it a leading candidate for cryogenic thermoelectric cooling devices. However, the origin of this unusual behavior is controversial, having been variously attributed to electronic correlations as well as the phonon-drag effect. The optical proper- ties of a material provide information on both the electronic and vibrational properties. The optical conductivity reveals an anisotropic response at room temperature; the low-frequency optical conductivity decreases rapidly with temperature, signalling a metal-insulator transition. One-dimensional semiconducting behavior is observed along the b axis at low temperature, in agreement with first-principle calculations. Here, the infrared-active lattice vibrations are also symmetric and extremely narrow, indicating long phonon relaxation times and a lack of electron-phonon coupling.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1462129
Alternate Identifier(s):
OSTI ID: 1462421
Report Number(s):
BNL-207909-2018-JAAM
Journal ID: ISSN 2045-2322; 11692; PII: 29909
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 8 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Homes, C. C., Du, Q., Petrovic, C., Brito, W. H., Choi, S., and Kotliar, G. Unusual electronic and vibrational properties in the colossal thermopower material FeSb2. United Kingdom: N. p., 2018. Web. doi:10.1038/s41598-018-29909-2.
Homes, C. C., Du, Q., Petrovic, C., Brito, W. H., Choi, S., & Kotliar, G. Unusual electronic and vibrational properties in the colossal thermopower material FeSb2. United Kingdom. doi:10.1038/s41598-018-29909-2.
Homes, C. C., Du, Q., Petrovic, C., Brito, W. H., Choi, S., and Kotliar, G. Fri . "Unusual electronic and vibrational properties in the colossal thermopower material FeSb2". United Kingdom. doi:10.1038/s41598-018-29909-2.
@article{osti_1462129,
title = {Unusual electronic and vibrational properties in the colossal thermopower material FeSb2},
author = {Homes, C. C. and Du, Q. and Petrovic, C. and Brito, W. H. and Choi, S. and Kotliar, G.},
abstractNote = {The iron antimonide FeSb2 possesses an extraordinarily high thermoelectric power factor at low temperature, making it a leading candidate for cryogenic thermoelectric cooling devices. However, the origin of this unusual behavior is controversial, having been variously attributed to electronic correlations as well as the phonon-drag effect. The optical proper- ties of a material provide information on both the electronic and vibrational properties. The optical conductivity reveals an anisotropic response at room temperature; the low-frequency optical conductivity decreases rapidly with temperature, signalling a metal-insulator transition. One-dimensional semiconducting behavior is observed along the b axis at low temperature, in agreement with first-principle calculations. Here, the infrared-active lattice vibrations are also symmetric and extremely narrow, indicating long phonon relaxation times and a lack of electron-phonon coupling.},
doi = {10.1038/s41598-018-29909-2},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United Kingdom},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1038/s41598-018-29909-2

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Cited by: 1 work
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