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The nature of complex magnetic interactions and the role of domain dynamics in Sr<sub>3</sub>(Ni,Co)IrO<sub>6</sub>

ORAL

Abstract

Iridium containing oxides have been continually attracting interest for studying emergent phases of matter. My talk focuses on the magnetic interactions in the iridate compounds Sr3(Ni,Co)IrO6, which have the highest coercive magnetic fields of up to 55 T of any materials to our knowledge. These compounds belong to a class of Ir4+ oxides in which the spin-orbit coupling, exchange interaction, crystal electric field energy scale and Hund’s rule U are within an order of magnitude. This results in the highly entangled spin-orbital Jeff = ½ state of Ir. The origin of this high coercive field is thought to be the 5d Ir4+ ion and its strong and unusual spin-orbit (S-O) coupling. However, the precise origin of the high coercive field, magnetic interactions, magnetic ordering and role of domain dynamics in these compounds are not yet understood. I present the result of our magnetization and, x-ray spectroscopy and dichroism studies to shed light on these questions.

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Presenters

  • Shalinee Chikara

    National High Magnetic Field Laboratory, National HIgh Magnetic Field Laboratory, Florida State University

Authors

  • Shalinee Chikara

    National High Magnetic Field Laboratory, National HIgh Magnetic Field Laboratory, Florida State University

  • Daniel Haskel

    Argonne National Laboratory, Advanced Photon Source, Argonne National Laboratory

  • Richard A Rosenberg

    Argonne National Laboratory

  • Sang-Wook Cheong

    Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University-New Brunswick, Rutgers Center for Emergent Materials, Rutgers University, Rutgers, The State University of New Jersey, Rutgers University, Department of Physics and Astronomy, Rutgers University, Center for Quantum Materials Synthesis, Rutgers University, Center for Emergent Materials and Department of Physics and Astronomy, Rutgers

  • Vivien Zapf

    Los Alamos Natl Lab, National High Magnetic Field Lab, Los Alamos National Lab, Pulsed Field Facility, Los Alamos National Lab, Los Alamos National Lab, Los Alamos National Laboratory