Spontaneous decays of magneto-elastic excitations in non-collinear antiferromagnet (Y,Lu)MnO3

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Title
Spontaneous decays of magneto-elastic excitations in non-collinear antiferromagnet (Y,Lu)MnO3
Author(s)
Joosung Oh; Manh Duc Le; Ho-Hyun Nahm; Hasung Sim; Jaehong Jeong; Perring, TG; Woo, H; Nakajima, K; Ohira-Kawamura, S; Yamani, Z; Yoshida, Y; Eisaki, H; Cheong, SW; Chernyshev, AL; Je-Geun Park
Publication Date
2016-10
Journal
NATURE COMMUNICATIONS, v.7, no., pp.13146 -
Publisher
NATURE PUBLISHING GROUP
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)MnO3 and quantified its decay rate and the exchange-striction coupling term required to produce it. (c) The Author(s) 2016
URI
https://pr.ibs.re.kr/handle/8788114/3043
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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