Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0≤x≤0.3) | Zendy

Gunadhor Singh Okram | Zendy; Netram Kaurav | Zendy; Ajay Soni | Zendy; Anand Pal | Zendy; V. P. S. Awana | Zendy

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Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0≤x≤0.3)

Author(s) -

Gunadhor Singh Okram,

Netram Kaurav,

Ajay Soni,

Anand Pal,

V. P. S. Awana

Publication year - 2012

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4766936

Subject(s) - seebeck coefficient , electrical resistivity and conductivity , condensed matter physics , superconductivity , crystallite , doping , fermi surface , electron , materials science , fermi level , spin (aerodynamics) , chemistry , crystallography , physics , thermodynamics , quantum mechanics

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

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