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.

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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