Magnetoelastic excitations in multiferroic hexagonal YMnO3 studied by inelastic x-ray scattering

Kisoo Park; Joosung Oh; Ki Hoon Lee; Jonathan C. Leiner; Hasung Sim; Ho Hyun Nahm; Taehun Kim; Jaehong Jeong; Daisuke Ishikawa; Alfred Q.R. Baron; Je Geun Park

doi:10.1103/PhysRevB.102.085110

Magnetoelastic excitations in multiferroic hexagonal YMnO3 studied by inelastic x-ray scattering

Kisoo Park, Joosung Oh, Ki Hoon Lee, Jonathan C. Leiner, Hasung Sim, Ho Hyun Nahm, Taehun Kim, Jaehong Jeong, Daisuke Ishikawa, Alfred Q.R. Baron, Je Geun Park

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Despite extensive studies, the exact mechanism of magnetoelastic coupling in hexagonal rare-earth manganite RMnO3 still remains under debate. Using inelastic x-ray scattering, we have measured the lattice vibrations of hexagonal manganite RMnO3 over a wide momentum-energy space to identify clear magnetoelastic excitations, which are the long-sought-after direct evidence of the dynamic magnon-phonon coupling. Our calculations using a magnetoelastic coupling model of superexchange striction quantitatively reproduces the experimental observations. Based on these results, we present a broadly applicable method to analyze the mode and momentum dependence of the magnon-phonon coupling for noncollinear magnets.

Original language	English
Article number	085110
Journal	Physical Review B
Volume	102
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.102.085110
State	Published - Aug 15 2020
Externally published	Yes

Funding

We thank Daniel I. Khomskii for useful discussions. Work at the IBS-CCES was supported by the research program of the Institute for Basic Science (IBS-R009-G1). IXS measurements were supported by the RIKEN SPring-8 Center under Proposal No. 20160099. J.-G.P. was partially supported by the Leading Researcher Program of the National Research Foundation of Korea (Grant No. 2020R1A3B2079375).

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title = "Magnetoelastic excitations in multiferroic hexagonal YMnO3 studied by inelastic x-ray scattering",

abstract = "Despite extensive studies, the exact mechanism of magnetoelastic coupling in hexagonal rare-earth manganite RMnO3 still remains under debate. Using inelastic x-ray scattering, we have measured the lattice vibrations of hexagonal manganite RMnO3 over a wide momentum-energy space to identify clear magnetoelastic excitations, which are the long-sought-after direct evidence of the dynamic magnon-phonon coupling. Our calculations using a magnetoelastic coupling model of superexchange striction quantitatively reproduces the experimental observations. Based on these results, we present a broadly applicable method to analyze the mode and momentum dependence of the magnon-phonon coupling for noncollinear magnets.",

author = "Kisoo Park and Joosung Oh and Lee, {Ki Hoon} and Leiner, {Jonathan C.} and Hasung Sim and Nahm, {Ho Hyun} and Taehun Kim and Jaehong Jeong and Daisuke Ishikawa and Baron, {Alfred Q.R.} and Park, {Je Geun}",

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doi = "10.1103/PhysRevB.102.085110",

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AU - Park, Kisoo

AU - Oh, Joosung

AU - Lee, Ki Hoon

AU - Leiner, Jonathan C.

AU - Sim, Hasung

AU - Nahm, Ho Hyun

AU - Kim, Taehun

AU - Jeong, Jaehong

AU - Ishikawa, Daisuke

AU - Baron, Alfred Q.R.

AU - Park, Je Geun

PY - 2020/8/15

Y1 - 2020/8/15

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AB - Despite extensive studies, the exact mechanism of magnetoelastic coupling in hexagonal rare-earth manganite RMnO3 still remains under debate. Using inelastic x-ray scattering, we have measured the lattice vibrations of hexagonal manganite RMnO3 over a wide momentum-energy space to identify clear magnetoelastic excitations, which are the long-sought-after direct evidence of the dynamic magnon-phonon coupling. Our calculations using a magnetoelastic coupling model of superexchange striction quantitatively reproduces the experimental observations. Based on these results, we present a broadly applicable method to analyze the mode and momentum dependence of the magnon-phonon coupling for noncollinear magnets.

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Magnetoelastic excitations in multiferroic hexagonal YMnO3 studied by inelastic x-ray scattering

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