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Title: Polaronic transport and thermoelectricity in Fe 1 x Co x Sb 2 S 4 ( x = 0 , 0.1, and 0.2)

Journal Article · · Physical Review B
 [1];  [2];  [1];  [3];  [1];  [4];  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
  4. 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)
Grant/Contract Number:
SC0012704
OSTI ID:
1440351
Alternate ID(s):
OSTI ID: 1432406
Report Number(s):
BNL-205729-2018-JAAM; PRBMDO; TRN: US1900721
Journal Information:
Physical Review B, Vol. 97, Issue 15; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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Cited By (1)

Semilocal exchange-correlation potentials for solid-state calculations: Current status and future directions journal September 2019