The Effect of Cobalt Doping in Structural Phase Transition of SmFe<sub>1-x</sub>Co<sub>x</sub>AsO Measured by Low-temperature X-ray Diffraction

Authors

  • A. Khan Assistant Professor, Department of Physics, Shahjalal University of Science and Technology, Sylhet-3114
  • A. Rahman Department of Physics, Shahjalal University of Science and Technology, Sylhet-3114
  • S. Naher Professor, Department of Physics, Shahjalal University of Science and Technology, Sylhet-3114
  • H. Kaneko Associate Professor, Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • Y. Yun Researcher, Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • A. Savinkov Researcher, Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • H. Suzuki Professor, Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • Y. K. Li epartment of Physics, Zhejiang University, Hangzhou 310027
  • Q. Tao Department of Physics, Zhejiang University, Hangzhou 310027
  • G. H. Cao Department of Physics, Zhejiang University, Hangzhou 310027
  • Z. A. Xu Department of Physics, Zhejiang University, Hangzhou 310027

DOI:

https://doi.org/10.3329/jsr.v4i3.10248

Keywords:

SmFe1-xCoxAsO, Structural phase transition, Co concentration, X-ray diffraction.

Abstract

The parent compound SmFeAsO shows structural phase transition from tetragonal to orthorhombic at the temperature TD = 144 K. In the compound SmFe1-xCoxAsO,  with increasing x the structural transition temperature TD and  SDW TN decreases and reaches 0 K at the critical concentration xc. The X-ray diffraction technique has been used here to study the structural phase transition temperature. It is observed that the (400) peak of the parent compound SmFeAsO splits into two peaks (400) and (040), when the temperature is lower than the structural transition temperature TD. The structural phase transition of Co doped compounds SmFe1-xCoxAsO has also been studied for x = 0, 0.01, 0.025 and 0.075. The phase transition temperature TD for SmFe0.99Co0.01AsO, SmFe0.975Co0.025AsO and SmFe0.925Co0.075AsO are 134 K, 118 K and 4 K, respectively. The phase diagram of TD versus lattice spacing reveals that the structural transition temperature decreases with shrinking lattice constant along c-axis similar to the decrease of the structural phase transition temperature with increasing Co concentration. The phase diagrams of   SmFe1-xCoxAsO and Sm(O1-xFx)FeAs show a similar nature.

© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.

doi: http://dx.doi.org/10.3329/jsr.v4i3.10248 J. Sci. Res. 4 (3), 541-550 (2012)

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Published

2012-08-28

How to Cite

Khan, A., Rahman, A., Naher, S., Kaneko, H., Yun, Y., Savinkov, A., Suzuki, H., Li, Y. K., Tao, Q., Cao, G. H., & Xu, Z. A. (2012). The Effect of Cobalt Doping in Structural Phase Transition of SmFe<sub>1-x</sub>Co<sub>x</sub>AsO Measured by Low-temperature X-ray Diffraction. Journal of Scientific Research, 4(3), 541–550. https://doi.org/10.3329/jsr.v4i3.10248

Issue

Section

Section A: Physical and Mathematical Sciences