Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO3

Sonja Holm-Dahlin; Andreas Kreisel; Turi Kirstine Schäffer; August Bakke; Mads Bertelsen; Ursula Bengård Hansen; Maria Retuerto Millan; J. Larsen; D. Prabhakaran; P.P. Deen; Z. Yamani; Jonas Okkels Birk; U. Stuhr; Ch. Niedermayer; A.L. Fennell; Brian Møller Andersen; Kim Lefmann

doi:10.1103/PhysRevB.97.134304

Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO₃

Sonja Holm-Dahlin, Andreas Kreisel, Turi Kirstine Schäffer, August Bakke, Mads Bertelsen, Ursula Bengård Hansen, Maria Retuerto Millan, J. Larsen, D. Prabhakaran, P.P. Deen, Z. Yamani, Jonas Okkels Birk, U. Stuhr, Ch. Niedermayer, A.L. Fennell, Brian Møller Andersen, Kim Lefmann

X-ray and Neutron Science

11 Citationer (Scopus)

Abstract

Inelastic neutron scattering has been used to study the magnetoelastic excitations in the multiferroic manganite hexagonal YMnO3. An avoided crossing is found between magnon and phonon modes close to the Brillouin zone boundary in the (a,b) plane. Neutron polarization analysis reveals that this mode has mixed magnon-phonon character. An external magnetic field along the c axis is observed to cause a linear field-induced splitting of one of the spin-wave branches. A theoretical description is performed, using a Heisenberg model of localized spins, acoustic phonon modes, and a magnetoelastic coupling via the single-ion magnetostriction. The model quantitatively reproduces the dispersion and intensities of all modes in the full Brillouin zone, describes the observed magnon-phonon hybridized modes, and quantifies the magnetoelastic coupling. The combined information, including the field-induced magnon splitting, allows us to exclude several of the earlier proposed models and point to the correct magnetic ground state symmetry, and provides an effective dynamic model relevant for the multiferroic hexagonal manganites.

Originalsprog	Engelsk
Artikelnummer	134304
Tidsskrift	Physical Review B
Vol/bind	97
Udgave nummer	13
Antal sider	11
ISSN	2469-9950
DOI	https://doi.org/10.1103/PhysRevB.97.134304
Status	Udgivet - 17 apr. 2018

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10.1103/PhysRevB.97.134304

PhysRevB.97.134304Forlagets udgivne version, 2,55 MB

https://arxiv.org/pdf/1707.02468.pdfLicens: Andet

Citationsformater

Holm-Dahlin, S., Kreisel, A., Schäffer, T. K., Bakke, A., Bertelsen, M., Hansen, U. B., Retuerto Millan, M., Larsen, J., Prabhakaran, D., Deen, P. P., Yamani, Z., Birk, J. O., Stuhr, U., Niedermayer, C., Fennell, A. L., Andersen, B. M., & Lefmann, K. (2018). Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO₃. Physical Review B, 97(13), Artikel 134304 . https://doi.org/10.1103/PhysRevB.97.134304

Holm-Dahlin, S , Kreisel, A, Schäffer, TK, Bakke, A, Bertelsen, M, Hansen, UB, Retuerto Millan, M, Larsen, J, Prabhakaran, D, Deen, PP, Yamani, Z, Birk, JO, Stuhr, U, Niedermayer, C, Fennell, AL, Andersen, BM & Lefmann, K 2018, 'Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO₃', Physical Review B, bind 97, nr. 13, 134304 . https://doi.org/10.1103/PhysRevB.97.134304

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abstract = "Inelastic neutron scattering has been used to study the magnetoelastic excitations in the multiferroic manganite hexagonal YMnO3. An avoided crossing is found between magnon and phonon modes close to the Brillouin zone boundary in the (a,b) plane. Neutron polarization analysis reveals that this mode has mixed magnon-phonon character. An external magnetic field along the c axis is observed to cause a linear field-induced splitting of one of the spin-wave branches. A theoretical description is performed, using a Heisenberg model of localized spins, acoustic phonon modes, and a magnetoelastic coupling via the single-ion magnetostriction. The model quantitatively reproduces the dispersion and intensities of all modes in the full Brillouin zone, describes the observed magnon-phonon hybridized modes, and quantifies the magnetoelastic coupling. The combined information, including the field-induced magnon splitting, allows us to exclude several of the earlier proposed models and point to the correct magnetic ground state symmetry, and provides an effective dynamic model relevant for the multiferroic hexagonal manganites.",

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T1 - Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO3

AU - Holm-Dahlin, Sonja

AU - Kreisel, Andreas

AU - Schäffer, Turi Kirstine

AU - Bakke, August

AU - Bertelsen, Mads

AU - Hansen, Ursula Bengård

AU - Retuerto Millan, Maria

AU - Larsen, J.

AU - Prabhakaran, D.

AU - Deen, P.P.

AU - Yamani, Z.

AU - Birk, Jonas Okkels

AU - Stuhr, U.

AU - Niedermayer, Ch.

AU - Fennell, A.L.

AU - Andersen, Brian Møller

AU - Lefmann, Kim

PY - 2018/4/17

Y1 - 2018/4/17

N2 - Inelastic neutron scattering has been used to study the magnetoelastic excitations in the multiferroic manganite hexagonal YMnO3. An avoided crossing is found between magnon and phonon modes close to the Brillouin zone boundary in the (a,b) plane. Neutron polarization analysis reveals that this mode has mixed magnon-phonon character. An external magnetic field along the c axis is observed to cause a linear field-induced splitting of one of the spin-wave branches. A theoretical description is performed, using a Heisenberg model of localized spins, acoustic phonon modes, and a magnetoelastic coupling via the single-ion magnetostriction. The model quantitatively reproduces the dispersion and intensities of all modes in the full Brillouin zone, describes the observed magnon-phonon hybridized modes, and quantifies the magnetoelastic coupling. The combined information, including the field-induced magnon splitting, allows us to exclude several of the earlier proposed models and point to the correct magnetic ground state symmetry, and provides an effective dynamic model relevant for the multiferroic hexagonal manganites.

AB - Inelastic neutron scattering has been used to study the magnetoelastic excitations in the multiferroic manganite hexagonal YMnO3. An avoided crossing is found between magnon and phonon modes close to the Brillouin zone boundary in the (a,b) plane. Neutron polarization analysis reveals that this mode has mixed magnon-phonon character. An external magnetic field along the c axis is observed to cause a linear field-induced splitting of one of the spin-wave branches. A theoretical description is performed, using a Heisenberg model of localized spins, acoustic phonon modes, and a magnetoelastic coupling via the single-ion magnetostriction. The model quantitatively reproduces the dispersion and intensities of all modes in the full Brillouin zone, describes the observed magnon-phonon hybridized modes, and quantifies the magnetoelastic coupling. The combined information, including the field-induced magnon splitting, allows us to exclude several of the earlier proposed models and point to the correct magnetic ground state symmetry, and provides an effective dynamic model relevant for the multiferroic hexagonal manganites.

U2 - 10.1103/PhysRevB.97.134304

DO - 10.1103/PhysRevB.97.134304

M3 - Journal article

SN - 2469-9950

VL - 97

JO - Physical Review B

JF - Physical Review B

IS - 13

M1 - 134304

ER -

Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO3

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Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO₃