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

9 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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10.1103/PhysRevB.102.085110

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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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month = aug,

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doi = "10.1103/PhysRevB.102.085110",

language = "English",

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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

N2 - 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.

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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DO - 10.1103/PhysRevB.102.085110

M3 - Article

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JO - Physical Review B

JF - Physical Review B

IS - 8

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ER -

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

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