Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0 <= x <= 0.3)
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0 <= x <= 0.3)
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| Creator |
Okram, Gunadhor S.
Kaurav, Netram Soni, Ajay Pal, Anand Awana, V. P. S. |
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| Subject |
Materials Science
Applied Physics/Condensed Matter Nanoscience/ Nanotechnology |
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| Description |
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.
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| Publisher |
American Institute of Physics
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| Date |
2012-12
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/3635/1/Effect%20of%20Co-doping%20on%20the%20resistivity%20and%20thermopower.pdf
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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| Relation |
http://npl.csircentral.net/3635/
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