Magnetization plateaus in Tb2SrFe2O7

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.

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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