Magnetization plateaus in Tb<sub>2</sub>SrFe<sub>2</sub>O<sub>7</sub>

ORAL

Abstract

Discovery of emergent magnetic states has drawn a lot of interest in studying geometrically frustrated magnets. We recently studied magnetization plateaus in a layered perovskite Tb2SrFe2O7. Tb2SrFe2O7 has a bilayer perovskite structure (A3B2O7) with Tb and Sr both at A-sites alternately ordered along the c-axis. Different from the multiferroic Ca2SrFe2O7 that hosts the polar crystal structure and the magnetic ordered state with canted Fe moments, Tb2SrFe2O7 has the non-polar structure symmetry of P42/mnm and the antiferromagnetic structure for the Fe-sublattice below 600 K. The magnetization plateaus were observed below the second transition at 15 K. With the field applied along c-axis, three plateaus were observed. Single crystal neutron diffraction revealed that the magnetic transition at 15 K is from magnetic order of Tb-sublattice accompanied with the spin reorientation of Fe-sublattice. It was also proved that the order of 2-in-2-out spin structure is due to magnetic coupling with the Fe-sublattice. In this presentation, I will show the evolution of the spin structure with temperature and magnetic field and disclose the nature of the magnetization plateaus in Tb2SrFe2O7.

*This research used resources at SNS and HFIR, DOE Office of Science User Facilities operated by the ORNL.

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Presenters

  • Huibo Cao

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

Authors

  • Huibo Cao

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Yan Wu

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

  • Wei Tian

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

  • Jae-Wook Kim

    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, New Jersey

  • Sang-Wook Cheong

    • Rutgers University
    • Department of Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers University
    • Center for Quantum Materials Synthesis and Department of Physics and Astronomy, Rutgers, the State University of New Jersey
    • Department of Physics, Rutgers University
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Physics, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, New Jersey
    • Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science
    • RCEM, Department of Physics and Astronomy, Rutgers U.
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials