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- W1997370269 abstract "Magnons near the Brillouin zone-edge were generated in antiferromagnetic ${mathrm{MnF}}_{2}$:${mathrm{Er}}^{3+}$ at 1.9 K by exciting the intrinsic two-magnon absorption band using a pulsed far-infrared laser. The lowest Stark level of the ${mathrm{Er}}^{3+}$ ground state was used as a 36-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ magnon and phonon detector in a quantum-counter scheme. A simple set of rate equations was used to model the system. The decay time was found to be 2.9ifmmodepmelsetextpmfi{}0.6 ensuremath{mu}s for 55-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, 3ifmmodepmelsetextpmfi{}2 ensuremath{mu}s for 47.6-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ magnons, and 40ifmmodepmelsetextpmfi{}20 ns for 36-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ phonons. The sum of the 36-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ magnon decay rate and the ${mathrm{Er}}^{3+}$-magnon decay rate was 0.9ifmmodepmelsetextpmfi{}0.2 ensuremath{mu}${mathrm{s}}^{mathrm{ensuremath{-}}1}$. Possible mechanisms of magnon decay are discussed. The dominant mechanism is most likely thermal magnon-magnon scattering. No evidence of large-wave-vector magnon decay to 36-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ phonons was found. We suggest that magnons do not decay to phonons until they scatter into the magnetoelastic modes. Implications with respect to recent magnon-transport experiments are discussed." @default.
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- W1997370269 title "Dynamics of large-wave-vector magnons and phonons in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>MnF</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Er</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:…" @default.
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- W1997370269 doi "https://doi.org/10.1103/physrevb.42.720" @default.
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