Effect of Co-doping on the resistivity and thermopower of SmFe 1-xCoxAsO (0.0≤x≤0.3)

Gunadhor S. Okram, Netram Kaurav, Ajay Soni, Anand Pal, V. P.S. Awana

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2 Citations (Scopus)


We report structure, electrical resistivity and thermopower of polycrystalline SmFe1-x CoxAsO 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 μV/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.

Original languageEnglish
Article number042137
JournalAIP Advances
Issue number4
Publication statusPublished - 12-2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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