Neutron scattering study of the evolution from ferromagnetism to antiferromagnetism in NaCrSi<sub>x</sub>Ge<sub>2-x</sub>O<sub>6</sub> pyroxenes

ORAL

Abstract

NaCrGe2O6 and NaCrSi2O6 are isostructural compounds exhibiting different magnetic ground state. NaCrGe2O6 adopts a ferromagnetic ground state with Tc=6K, whereas NaCrSi2O6 orders antiferromagnetically at TN=3K. The complex magnetic behavior in Cr-based pyroxenes involves competition between direct and super-exchange magnetic interactions - a delicate balance that is sensitive to the Cr-Cr distance and chemical pressure. Here we present a systematic neutron scattering study of NaCrSixGe2-xO6 that reveals how the substitution of Ge by Si affects the evolution from ferromagnetism to antiferromagnetism in theses compounds.

*Research conducted at ORNL's Spallation Neutron Source and High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U. S. Department of Energy.

–

Presenters

  • Wei Tian

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory

Authors

  • Wei Tian

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory

  • Jiaqiang Yan

    • Oak Ridge National Laboratory (USA)
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Materials Science and Technology, Materials Science and Technology
    • Oak Ridge National Lab
    • Materials Science and Engineering, The University of Tennessee

  • Alexander I Kolesnikov

    • ORNL
    • Oak Ridge National Laboratory
    • Spallation Neutron Source, Oak Ridge National Laboratory

  • Brian Craig Sales

    • Oak Ridge National Laboratory