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Title: Spontaneous decays of magneto-elastic excitations in non-collinear antiferromagnet (Y,Lu)MnO 3

Here, 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)MnO 3 and quantified its decay rate and the exchange-striction coupling term required to produce it.
Authors:
 [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [8] ;  [1]
  1. Institute of Basic Science, Seoul (Korea); Seoul National Univ., Seoul (Korea)
  2. STFC Rutherford Appleton Lab., Didcot (United Kingdom)
  3. STFC Rutherford Appleton Lab., Didcot (United Kingdom); Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Japan Atomic Energy Agency, Ibaraki (Japan)
  5. Chalk River Lab., Chalk River, ON (Canada)
  6. National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
  7. Rutgers Univ., Piscataway, NJ (United States)
  8. Univ. of California, Irvine, CA (United States)
Publication Date:
Grant/Contract Number:
FG02-04ER46174; FG02-07ER46382
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Univ. of California, Irvine, CA (United States); Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; condensed-matter physics; ferroelectrics and multiferroics; magnetic properties and materials
OSTI Identifier:
1361413