title: Spontaneous decays of magneto-elastic excitations in non-collinear antiferromagnet (Y,Lu)MnO3.
abstract: Magnons and phonons are fundamental quasiparticles in a solid and can be coupled together to form a hybrid quasi-particle. However, detailed experimental studies on the underlying Hamiltonian of this particle are rare for actual materials. Moreover, the anharmonicity of such magnetoelastic excitations remains largely unexplored, although it is essential for a proper understanding of their diverse thermodynamic behaviour and intrinsic zero-temperature decay. Here we show that in non-collinear antiferromagnets, a strong magnon-phonon coupling can significantly enhance the anharmonicity, resulting in the creation of magnetoelastic excitations and their spontaneous decay. By measuring the spin waves over the full Brillouin zone and carrying out anharmonic spin wave calculations using a Hamiltonian with an explicit magnon-phonon coupling, we have identified a hybrid magnetoelastic mode in (Y,Lu)MnO3and quantified its decay rate and the exchange-striction coupling term required to produce it.
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University, Kwanak-Gu, Seoul 08826, Korea.
authors.forename: Joosung
authors.initials: J
authors.lastname: Oh
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University, Kwanak-Gu, Seoul 08826, Korea.
authors.forename: Manh Duc
authors.identifier: 0000-0003-3012-6053
authors.initials: MD
authors.lastname: Le
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University, Kwanak-Gu, Seoul 08826, Korea.
authors.forename: Ho-Hyun
authors.initials: HH
authors.lastname: Nahm
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University, Kwanak-Gu, Seoul 08826, Korea.
authors.forename: Hasung
authors.initials: H
authors.lastname: Sim
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University, Kwanak-Gu, Seoul 08826, Korea.
authors.forename: Jaehong
authors.initials: J
authors.lastname: Jeong
authors.affiliation: ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK.
authors.forename: T G
authors.initials: TG
authors.lastname: Perring
authors.affiliation: ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK.|Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Hyungje
authors.initials: H
authors.lastname: Woo
authors.affiliation: Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Nakajima
authors.affiliation: Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Seiko
authors.initials: S
authors.lastname: Ohira-Kawamura
authors.affiliation: Chalk River Laboratories, National Research Council, Chalk River, Ontario, Canada K0J 1J0.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Yamani
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Eisaki
authors.affiliation: Department of Physics and Astronomy, and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.affiliation: Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Chernyshev
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University, Kwanak-Gu, Seoul 08826, Korea.
authors.forename: Je-Geun
authors.initials: JG
authors.lastname: Park