Magnetic Properties of the Q1D Solid Solution Ca<sub>x-1</sub>Na<sub>x</sub>Cr<sub>2</sub>O<sub>4 </sub>Studied with Neutrons and Muons

ORAL

Abstract

In this work we present the results of the measurements carried out by neutron powder diffraction and muon spin rotation/relaxation (μ+SR) in ambient and high pressure on the x = 1 (NaCr2O4) and x = 0 (CaCr2O4) members of the solid soution Ca1−xNaxCr2O4 and on the intermediate compound x = 0.5 (Ca0.5Na0.5Cr2O4). The x = 1 results show a unique spin structure where the Cr moments in each zig-zag chain are aligned ferromagnetically along the c-axis, whereas antiferromagnetically along the a-axis between the adjacent zig-zag chains. The x = 0 results show the formation of a complex magnetic order below TN, that is consistent with an incommensurate AF (IC-AF) order. The investigation on the intermediate compound Ca1−xNaxCr2O4 showes a fast-relaxing component, possibly indicating a spin-glass state. Moreover, the magnetic order was shown to be almost completely unsensitive to pressures (up to p » 25 kbar), hereby revealing that the effect from the tuning of the spin density of the chains is clearly dominant.

*This research is fully funded by the Swedish Foundation for Strategic Research (SSF) within the Swedish national graduate school in neutron scattering (SwedNess).

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Presenters

  • Elisabetta Nocerino

    • Royal Institute of Technology
    • Applied Physics, KTH Royal Institute of Technology

Authors

  • Elisabetta Nocerino

    • Royal Institute of Technology
    • Applied Physics, KTH Royal Institute of Technology

  • Ola Kenji Forslund

    • Materials and Nano Physics, KTH Royal Institut of Technology
    • Royal Institute of Technology
    • Applied Physics, KTH Royal Institute of Technology

  • Yasmine Sassa

    • Department of Physics and Astronomy, Uppsala University
    • Uppsala University
    • Physics and Astronomy, Uppsala University

  • Daniel Andreica

    • Babes-Bolyai University
    • Physics, Babes-Bolyai University

  • Hiroshi Nozaki

    • Toyota Central Research and Development Laboratories Inc.
    • Toyota Central research and Development Lab

  • Gediminas Simutis

    • Paul Sherrer Institut

  • Jean-Christophe Orain

    • muSR group, Paul Scherrer Institute, 5232 Villigen, Switzerland
    • Paul Scherrer Institute, Villigen, Switzerland
    • Paul Sherrer Institut

  • Hiroya Sakurai

    • National Institute for Materials Science

  • Rustem Khasanov

    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    • Paul Scherrer Institut
    • Paul Scherrer Institute
    • Paul Sherrer Institut
    • PSI, 5232 Villigen, Switzerland

  • Jun Sugiyama

    • Toyota Central Research and Development Laboratories Inc.
    • Toyota Central research and Development Lab

  • Izumi Umegaki

    • Toyota Central Research and Development Laboratories Inc.
    • Toyota Central research and Development Lab

  • Martin Månsson

    • Materials and Nano Physics, KTH Royal Institut of Technology
    • Royal Institute of Technology
    • KTH Royal Institute of Technology
    • Applied Physics, KTH Royal Institute of Technology