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

doi:10.1063/1.4766936

Effect of Co-doping on the resistivity and thermopower of SmFe _1-xCo_xAsO (0.0≤x≤0.3)

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report structure, electrical resistivity and thermopower of polycrystalline SmFe_1-x Co_xAsO 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 language	English
Article number	042137
Journal	AIP Advances
Volume	2
Issue number	4
DOIs	https://doi.org/10.1063/1.4766936
Publication status	Published - 12-2012

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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@article{7e094397b44841ff994a9ae62ac3c7d1,

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

abstract = "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.",

author = "Okram, \{Gunadhor S.\} and Netram Kaurav and Ajay Soni and Anand Pal and Awana, \{V. P.S.\}",

note = "Funding Information: Financial assistance from Department of Science and Technology (DST), New Delhi, India is gratefully acknowledged.",

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T1 - Effect of Co-doping on the resistivity and thermopower of SmFe 1-xCoxAsO (0.0≤x≤0.3)

AU - Okram, Gunadhor S.

AU - Kaurav, Netram

AU - Soni, Ajay

AU - Pal, Anand

AU - Awana, V. P.S.

N1 - Funding Information: Financial assistance from Department of Science and Technology (DST), New Delhi, India is gratefully acknowledged.

PY - 2012/12

Y1 - 2012/12

N2 - 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.

AB - 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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VL - 2

JO - AIP Advances

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M1 - 042137

ER -

Effect of Co-doping on the resistivity and thermopower of SmFe _1-xCo_xAsO (0.0≤x≤0.3)

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