Investigating the Skyrmion Phase Diagram in Polycrystalline Chemically Substituted Cu<sub>2</sub>OSeO<sub>3</sub> with Small Angle Neutron Scattering

ORAL

Abstract

The chiral helimagnet Cu2OSeO3 is now understood to host a variety of interesting magnetic phases. The stability of these phases is sensitive to many parameters, including magnetic field and temperature history, magnetic field direction, and chemical tuning. Here, we discuss results studying the magnetic phase diagram of chemically substituted polycrystalline (Cu1-xMx)2OSeO3, M = (Ag, Zn), and Cu2(O1-xSx)2SeO2 with bulk magnetization and small angle neutron scattering (SANS). Notably, we perform SANS measurements after rotation of our powdered samples in a magnetic-field to resolve 6-fold symmetric skyrmion lattice diffraction patterns. This allows us to gleam information about the skyrmion lattice order and magnetocrystalline anisotropy. Bulk magnetization suggests an enhancement of skyrmion temperature stability in the Ag and S substituted samples, while SANS suggests a generic decrease in the ability of field rotation to align skyrmion lattices in chemically disordered systems. Additionally, we are unable to confirm the presence of a second skymion phase in Zn substituted samples.

*DMR-1508249

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Presenters

  • Paul Neves

    • Department of Physics, University of Maryland, College Park

Authors

  • Paul Neves

    • Department of Physics, University of Maryland, College Park

  • Dustin Gilbert

    • National Institute of Standards and Technology Center for Neutron Research
    • Material Science Depeartment, University of Tennessee
    • University of Tennessee

  • Sheng Ran

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • University of Maryland, College Park
    • National Institute of Standards and Technology
    • Physics Department, University of Maryland
    • University of Maryland
    • University of Maryland, College Park & NIST
    • Department of Physics, University of Maryland, College Park
    • NIST Center for Neutron Research

  • I-Lin Liu

    • Physics Department, University of Maryland
    • Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park
    • NIST Center for Neutron Research

  • Shanta Saha

    • Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park
    • University of Maryland, College Park
    • Department of Physics, University of Maryland, College Park

  • John Collini

    • University of Maryland, College Park
    • Department of Physics, University of Maryland, College Park

  • Markus Bleuel

    • Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology Center for Neutron Research
    • NIST
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology

  • Johnpierre Paglione

    • University of Maryland, College Park
    • Physics Department, University of Maryland
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park
    • Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park & NIST
    • Univ of Maryland-Colege Park
    • Center for Quantum Materials, University of Maryland
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742

  • Julie Ann Borchers

    • National Institute of Standards and Technology Center for Neutron Research
    • National Institute of Standards and Technology
    • NIST Center for Neutron Research, National Institute of Standards and Technology

  • Nicholas Butch

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • Center of Neutron Research, National Institute of Standards and Technology
    • Center for Neutron Research, National Institute of Standards and Technology
    • NIST Center for Neutron Research
    • NIST center for neutron research
    • NIST
    • NIST Center for Neutron Research, National Institute of Standards and Technology,
    • University of Maryland, College Park & NIST
    • National Institute of Standards and Technology Center for Neutron Research