Spin texture induced by non-magnetic doping and spin dynamics in 2D triangular lattice antiferromagnet h-Y(Mn,Al)O3

Pyeongjae Park, Kisoo Park, Joosung Oh, Ki Hoon Lee, Jonathan C. Leiner, Hasung Sim, Taehun Kim, Jaehong Jeong, Kirrily C. Rule, Kazuya Kamazawa, Kazuki Iida, T. G. Perring, Hyungje Woo, S.-W. Cheong, M. E. Zhitomirsky, A. L. Chernyshev and Je-Geun Park ()
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Pyeongjae Park: Seoul National University
Kisoo Park: Seoul National University
Joosung Oh: Seoul National University
Ki Hoon Lee: Seoul National University
Jonathan C. Leiner: Seoul National University
Hasung Sim: Seoul National University
Taehun Kim: Seoul National University
Jaehong Jeong: Seoul National University
Kirrily C. Rule: Australian Nuclear Science and Technology Organisation
Kazuya Kamazawa: Comprehensive Research Organization for Science and Society (CROSS), Tokai
Kazuki Iida: Comprehensive Research Organization for Science and Society (CROSS), Tokai
T. G. Perring: ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory
Hyungje Woo: ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory
S.-W. Cheong: Rutgers University
M. E. Zhitomirsky: Université Grenoble Alpes, CEA, IRIG, PHELIQS
A. L. Chernyshev: University of California
Je-Geun Park: Seoul National University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Novel effects induced by nonmagnetic impurities in frustrated magnets and quantum spin liquid represent a highly nontrivial and interesting problem. A theoretical proposal of extended modulated spin structures induced by doping of such magnets, distinct from the well-known skyrmions has attracted significant interest. Here, we demonstrate that nonmagnetic impurities can produce such extended spin structures in h-YMnO3, a triangular antiferromagnet with noncollinear magnetic order. Using inelastic neutron scattering (INS), we measured the full dynamical structure factor in Al-doped h-YMnO3 and confirmed the presence of magnon damping with a clear momentum dependence. Our theoretical calculations can reproduce the key features of the INS data, supporting the formation of the proposed spin textures. As such, our study provides the first experimental confirmation of the impurity-induced spin textures. It offers new insights and understanding of the impurity effects in a broad class of noncollinear magnetic systems.

Date: 2021
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DOI: 10.1038/s41467-021-22569-3

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