Polaronic transport and thermoelectricity in ( , 0.1, and 0.2)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Rutgers Univ., Piscataway, NJ (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Rutgers Univ., Piscataway, NJ (United States)
Here, we report a study of Co-doped berthierite Fe1–xCoxSb2S4 (x=0, 0.1, and 0.2). The alloy series of Fe1–xCoxSb2S4 crystallize in an orthorhombic structure with the Pnma space group, similar to FeSb2, and show semiconducting behavior. The large discrepancy between activation energy for conductivity, Eρ (146 ~270meV), and thermopower, ES (47 ~108 meV), indicates the polaronic transport mechanism. Bulk magnetization and heat-capacity measurements of pure FeSb2S4 (x=0) exhibit a broad antiferromagnetic transition (TN = 46K) followed by an additional weak transition (T* = 50K). Transition temperatures (TN and T*) slightly decrease with increasing Co content x. This is also reflected in the thermal conductivity measurement, indicating strong spin-lattice coupling. Fe1–xCoxSb2S4 shows relatively high value of thermopower (up to ~624μVK–1 at 300 K) and thermal conductivity much lower when compared to FeSb2, a feature desired for potential applications based on FeSb2 materials.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1440351
- Alternate ID(s):
- OSTI ID: 1432406
- Report Number(s):
- BNL--205729-2018-JAAM
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 15 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Semilocal exchange-correlation potentials for solid-state calculations: Current status and future directions
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journal | September 2019 |
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