Neutron scattering study of the evolution from ferromagnetism to antiferromagnetism in NaCrSixGe2-xO6 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.

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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