Structural changes in pressure induced superconducting BaFe$_{2}$As$_{2}$: Similarities to chemical doping

ORAL

Abstract

We have determined the crystal structure of BaFe$_{2}$As$_{2}$ as a function of temperature (4$-$150 K) and pressure (0$-$6 GPa) using neutron powder diffraction. The structural features important to superconductivity, namely suppression of the T$-$O phase transition and reduction in the As$-$Fe$-$As bond angle and Fe$-$Fe distance, show exactly the same behaviour under pressure up to the optimal T$_{C}$ value, as found in chemically doped samples. This result suggests that chemical doping and pressure have similar effects on the electronic degrees of freedom in this family of iron pnictide superconductors.

–

Authors

  • Simon Kimber

    Helmholtz-Zentrum Berlin fur Materialien und Energie (HZB)

  • Andreas Kreyssig

    Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA, Ames Laboratory and Iowa State University, Ames Laboratory, US DOE and Iowa State University, Ames Laboratory/Department of Physics and Astronomy, Ames Laboratory, US DOE, Iowa State University, Ames, IA 5001, USA

  • Fabiano Yokaichiya

    Helmholtz-Zentrum Berlin fur Materialien und Energie (HZB)

  • Dimitri Argyriou

    Helmholtz-Zentrum Berlin fur Materialien und Energie (HZB)

  • J.-Q. Yan

    Ames Laboratory, US DOE, Iowa State University, Ames, IA 5001, USA, Texas Material Institute, U of Texas at Austin

  • Thomas Hansen

    Institute Max von Laue-Paul Langevin, 6 rue Jules Horowitz,

  • Tapan Chatterji

    JCNS, Forschungszentrum Julich Outstation at Institut Laue-Langevin

  • Robert McQueeney

    Ames Laboratory, US DOE, Iowa State University, Ames, IA 5001, USA

  • Paul Canfield

    Ames Laboratory, US DOE, Iowa State University, Ames, IA 5001, USA

  • Alan Goldman

    Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA, Ames Laboratory and Iowa State University, Ames Laboratory, US DOE and Iowa State University, Ames Laboratory, Ames Loboratory, US DOE and Iowa State University, Ames Laboratory/Department of Physics and Astronomy, Ames Laboratory, US DOE, Iowa State University, Ames, IA 5001, USA