Competing paramagnetic phases and itinerant magnetic frustration in SrCo<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

Cobalt arsenides with a layered square lattice tend to be itinerant ferromagnets. However, using inelastic neutron scattering we find in SrCo2As2 stripe-type antiferromagnetic (AF) spin fluctuations, though no long-range AF order is observed down to 50 mK. The stripe phase competes with the itinerant ferromagnetism and wins below 115 K, resulting in the development of AF spin fluctuations concomitant with a suppression of the uniform magnetic susceptibility. Comparison of our experimental data to exact diagonalization and classical Monte Carlo simulations of a frustrated local-moment J1-J2 model suggests that itinerancy enhances frustration. We conclude that SrCo2As2 is a candidate for frustrated itinerant magnetism and harbors unique frustrated magnetism on the boundary between itinerant ferromagnetic and stripe AF instabilities.

*This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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Presenters

  • Bing Li

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

Authors

  • 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

  • Wageesha T Jayasekara

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

  • Douglas L Abernathy

    • Spallation Neutron Source, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475, USA

  • Sangeetha N. S.

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

  • David C Johnston

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

  • Qing-Ping Ding

    • Ames Laboratory, Iowa State University
    • Ames Laboratory
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Iowa State University & Ames Lab

  • Yuji Furukawa

    • Ames Laboratory, Iowa State University
    • Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Iowa State University & Ames Lab
    • Ames Lab & Dept of Physics and Astronomy, Iowa State University
    • Iowa State University

  • Peter P. Orth

    • Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University
    • Iowa State University, Ames IA
    • Physics and Astronomy, Iowa State University
    • Department of physics and astronomy, Iowa State University/Ames Laboratory

  • 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

  • Alan Ira Goldman

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

  • Robert McQueeney

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