Influence of the Fluoride Atoms Doping on the FeSe Superconductor

A. D. Bortolozo, A. D. Gueiros, L. M. S. Alves, C. A. M. dos Santos

Departamento de Engenharia de Materiais, Escola de Engenharia de Lorena—USP, Lorena, Brazil.

DOI: 10.4236/msa.2012.39090                

Abstract

It is reported the influence of the interstitial atoms doping on the FeSe superconductor. Polycrystalline samples with FeSeF_x and FeSeB_x nominal compositions were prepared by solid state reaction. An enhancement of the superconducting transition temperature was observed in the temperature dependence of the electrical resistivity curve to the FeSeF_0.015 sample. R(T) data display superconducting behavior close to 12 K. The T_c increased with F doping by up to 50%. In contrast, boron doping no change the superconducting properties of the FeSe compound. As the FeSeF_x and FeSeB_x system the fluoride doping introduce a negative chemical pressure in the FeSe superconductor. This fact suggests that fluoride doping have changed the electronic properties of the FeSe phase.

Keywords

Superconductivity; Pnictides; Interstitial

Conflicts of Interest

The authors declare no conflicts of interest.

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