Microscopic analysis of the chemical reaction between Fe(Te,Se) thin films and underlying CaF$_2$

A. Ichinose; I. Tsukada; M. Hanawa; Seiki Komiya; T. Akiike; F. Nabeshima; Y. Imai; A. Maeda

doi:10.1088/0953-2048/26/7/075002

Microscopic analysis of the chemical reaction between Fe(Te,Se) thin films and underlying CaF$_2$

Superconductivity 2015-06-11 v1

Authors: A. Ichinose , I. Tsukada , M. Hanawa , Seiki Komiya , T. Akiike , F. Nabeshima , Y. Imai , A. Maeda

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Abstract

To understand the chemical reaction at the interface of materials, we performed a transmission electron microscopy (TEM) observation in four types of Fe(Te,Se) superconducting thin films prepared on different types of substrates: CaF2 substrate, CaF2 substrate with a CaF2 buffer layer, CaF2 substrate with a FeSe buffer layer, and a LaAlO3 substrate with a CaF2 buffer layer. Based on the energy-dispersive X-ray spectrometer (EDX) analysis, we found possible interdiffusion between fluorine and selenium that has a strong influence on the superconductivity in Fe(Te,Se) films. The chemical interdiffusion also plays a significant role in the variation of the lattice parameters. The lattice parameters of the Fe(Te,Se) thin films are primarily determined by the chemical substitution of anions, and the lattice mismatch only plays a secondary role.

Keywords

fe(te,se) thin films chemical reaction transmission electron microscopy interdiffusion superconductivity lattice parameters

Cite

@article{arxiv.1208.3287,
  title  = {Microscopic analysis of the chemical reaction between Fe(Te,Se) thin films and underlying CaF$_2$},
  author = {A. Ichinose and I. Tsukada and M. Hanawa and Seiki Komiya and T. Akiike and F. Nabeshima and Y. Imai and A. Maeda},
  journal= {arXiv preprint arXiv:1208.3287},
  year   = {2015}
}

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30 pages, 9 figure

Microscopic analysis of the chemical reaction between Fe(Te,Se) thin films and underlying CaF$_2$

Abstract

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