Magnetic field tuning of non-reciprocal and achiral spin waves in antiferromagnetic Ba<sub>3</sub>NbFe<sub>3</sub>Si<sub>2</sub>O<sub>14</sub>

ORAL

Abstract

Reciprocity, in the context of optics and scattering, is defined as invariance when a source and detector are swapped indicating that the motion of an object in one direction being the same as that in the opposite. We investigate the magnetic field tuning of non-reciprocal spin waves in antiferromagnetic langasite Ba3NbFe3Si2O14 using neutron spectroscopy. Applying a time reversal symmetry breaking magnetic field that also breaks a two-fold symmetry of the underlying structure, different spin wave energies are observed when the sign is reversed for either the total momentum +/- Q=+/-(G +/- q) or applied magnetic field +/- μ0H. We discuss the scaling of this effect with field and suggest it microscopically originates from spin-orbit coupling mediated through antisymmetric exchange.

*We are grateful for funding from the EPSRC, the Carnegie Trust for the Universities of Scotland, the STFC and through the NSF (DMR-09447720).

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Presenters

  • Chris Stock

    • University of Edinburgh
    • Physics, University of Edinburgh
    • U. Edingburgh
    • Univ of Edinburgh

Authors

  • Chris Stock

    • University of Edinburgh
    • Physics, University of Edinburgh
    • U. Edingburgh
    • Univ of Edinburgh

  • Manila Songvilay

    • University of Edinburgh
    • Physics, University of Edinburgh

  • Jose A Rodriguez

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

  • Paolo G. Radaelli

    • Physics, University of Oxford
    • Clarendon Laboratory, University of Oxford
    • University of Oxford

  • Laurent Chapon

    • Physics, University of Oxford

  • 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