%0 Journal Article
%T Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0¡Üx¡Ü0.3)
%A Gunadhor S. Okram
%A Netram Kaurav
%A Ajay Soni
%A Anand Pal
%J AIP Advances
%D 2012
%I AIP Publishing LLC
%R 10.1063/1.4766936
%X We report structure, electrical resistivity and thermopower of polycrystalline SmFe1-x CoxAsO samples for 0.0 ¡Ü x ¡Ü 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 ¦ÌV/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.
%U http://link.aip.org/link/doi/10.1063/1.4766936