Phase transition, superstructure and physical properties of K2Fe4Se5

Y. J. Song; Z. Wang; Z. W. Wang; H. L. Shi; Z. Chen; H. F. Tian; G. F. Chen; H. X. Yang; J. Q. Li

doi:10.1209/0295-5075/95/37007

Phase transition, superstructure and physical properties of K2Fe4Se5

Superconductivity 2015-05-28 v1

Authors: Y. J. Song , Z. Wang , Z. W. Wang , H. L. Shi , Z. Chen , H. F. Tian , G. F. Chen , H. X. Yang , J. Q. Li

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Abstract

The structural features and physical properties of the antiferromagnetic K0.8Fe1.6Se2 (so called K2Fe4Se5 phase) have been studied in the temperature range from 300K up to 600K. Resistivity measurements on both single crystal and polycrystalline samples reveal a semiconducting behavior. Structural investigations of K2Fe4Se5 by means of transmission electron microscopy and powder x-ray diffraction demonstrate the presence of a well-defined superstructure within the a-b plane originating from a Fe-vacancy order along the [130] direction. Moreover, in-situ heating structural analysis shows that K0.8Fe1.6Se2 undergoes a transition of the Fe-vacancy order to disorder at about 600K. The phase separation and the Fe-vacancy ordering in the superconducting materials of KxFe2-ySe2 (0.2 \leq y \leq 0.3) has been briefly discussed.

Keywords

K2Fe4Se5 phase transition superstructure Fe-vacancy order antiferromagnetic semiconducting behavior

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@article{arxiv.1104.4844,
  title  = {Phase transition, superstructure and physical properties of K2Fe4Se5},
  author = {Y. J. Song and Z. Wang and Z. W. Wang and H. L. Shi and Z. Chen and H. F. Tian and G. F. Chen and H. X. Yang and J. Q. Li},
  journal= {arXiv preprint arXiv:1104.4844},
  year   = {2015}
}

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17pages, 5 figures, 1 table

Phase transition, superstructure and physical properties of K2Fe4Se5

Abstract

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