Okram, Gunadhor S. and Kaurav, Netram and Soni, Ajay and Pal, Anand and Awana, V. P. S. (2012) Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0 <= x <= 0.3). AIP Advances, 2 (4). 042137-0421344. ISSN 2158-3226

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We report structure, electrical resistivity and thermopower of polycrystalline SmFe1-xCoxAsO samples for 0.0 <= x <= 0.3. The XRD data revealed full Co substitution at Fe-site with slight compression of the unit cell. Resistivity data showed that the spin-density wave observed at 130 K for x = 0 is suppressed when x = 0.05, above which superconductivity emerges due to injection of mobile electrons, supporting the substitution of Co3+ at Fe2+ site but disappears for x = 0.3. The thermopower (S) data indicate that the majority of charge carriers is electron-like and its value reaches -81 mu V/K (at 300 K) for x = 0.3. Noticeable deviations from the expected linear behavior in S(T) at low temperatures and S/T against temperature curves at intermediate temperatures were observed. These observations were interpreted on the basis of nested Fermi surface and Umklapp processes.

Item Type: Article
Subjects: Materials Science
Applied Physics/Condensed Matter
Nanoscience/ Nanotechnology
Depositing User: Users 27 not found.
Date Deposited: 14 Feb 2020 07:43
Last Modified: 14 Feb 2020 07:43
URI: http://npl.csircentral.net/id/eprint/3635

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