Antiferromagnetic order in Sr(Co1-xNix)2As2 revealed by single-crystal neutron diffraction

ORAL

Abstract

SrCo2As2 has the same tetragonal lattice as the 122 Fe-based high Tc superconductors. It does not order magnetically, but inelastic neutron scattering experiments find antiferromagnetic (AF) fluctuations found in many of the 122 superconductors. Here we show results from neutron diffraction and magnetization experiments on single-crystals of Sr(Co1-xNix)2As2. However, the AF order is not stripe-type. Instead, the AF structure consists of ferromagnetic layers (with moments in the layer) that are stacked along c with an incommensurate propagation vector (0, 0, qz). The propagation vector is doping dependent, suggesting spin density wave order. Using high-energy x-ray diffraction, we also find no evidence for a structural phase transition accompanying the AF order.

–

Presenters

  • John Wilde

    Ames Laboratory/Iowa State University, Ames Laboratory, Iowa State University

Authors

  • John Wilde

    Ames Laboratory/Iowa State University, Ames Laboratory, Iowa State University

  • Andreas Kreyssig

    Ames Laboratory and Dept. of Physics, Iowa State University, Ames Laboratory, Iowa State University, Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames, Ames Laboratory/Iowa State University, Ames Laboratory & Department of Physics, Iowa State University

  • David Vaknin

    Ames Laboratory, Iowa State University, Ames Laboratory

  • Sangeetha N. S.

    Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University

  • Bing Li

    Ames Laboratory, Iowa State University, Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames, Ames Laboratory/Iowa State University

  • Benjamin Ueland

    Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University

  • David C Johnston

    Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University

  • Robert McQueeney

    Ames Laboratory, Iowa State University, Ames Laboratory, Ames Laboratory/Iowa State University

  • Alan Ira Goldman

    Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University