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

Xray and Neutron Science

11 Citations (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.

Original language	English
Article number	134304
Journal	Physical Review B
Volume	97
Issue number	13
Number of pages	11
ISSN	2469-9950
DOIs	https://doi.org/10.1103/PhysRevB.97.134304
Publication status	Published - 17 Apr 2018

Access to Document

10.1103/PhysRevB.97.134304

PhysRevB.97.134304Final published version, 2.55 MB

https://arxiv.org/pdf/1707.02468.pdfLicence: Other

Cite this

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), Article 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, vol. 97, no. 13, 134304 . https://doi.org/10.1103/PhysRevB.97.134304

@article{087acc9486584e7d9da25a62635c09e9,

title = "Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO3",

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.",

author = "Sonja Holm-Dahlin and Andreas Kreisel and Sch{\"a}ffer, {Turi Kirstine} and August Bakke and Mads Bertelsen and Hansen, {Ursula Beng{\aa}rd} and {Retuerto Millan}, Maria and J. Larsen and D. Prabhakaran and P.P. Deen and Z. Yamani and Birk, {Jonas Okkels} and U. Stuhr and Ch. Niedermayer and A.L. Fennell and Andersen, {Brian M{\o}ller} and Kim Lefmann",

year = "2018",

month = apr,

day = "17",

doi = "10.1103/PhysRevB.97.134304",

language = "English",

volume = "97",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "13",

}

TY - JOUR

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

Abstract

Access to Document

Fingerprint

Cite this

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