Pseudo-Goldstone magnon in the single-domain state of Sr3Fe2O7
In a recent experiment on IN5, we discovered a pseudo-Goldstone mode in the low-energy spectrum of the frustrated cubic spinel ZnCr2Se4. This soft spin-wave branch appears gapless within linear spin-wave theory (LSWT), but develops a small energy gap of 0.17 meV due to nonlinear corrections arising from quantum fluctuations. This offers a possibility to estimate the weak effects related to spin-wave scattering processes and to compare them with theory on a quantitative level. However, the complex unit cell of the pyrochlore sublattice formed by S=3/2 magnetic Cr3+ ions in the spinel structure leads to multiple spin-wave modes that complicate the calculations. It is therefore important to repeat the same experiment on a helimagnetic compound with a simpler tetragonal structure, with only one magnetic atom per unit cell. The perfect candidate material for this study is Sr3Fe2O7, which we already investigated earlier. Here we suggest to study the field-cooled single-domain state of Sr3Fe2O7, looking at the pseudo-Goldstone magnon that emanates from the suppressed magnetic reflection. We will measure its low-energy dispersion and spin gap that will be later compared with theory.
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Dmytro Inosov; OLLIVIER Jacques; ONYKIIENKO Yevhen and Yuliia Tymoshenko. (2018). Pseudo-Goldstone magnon in the single-domain state of Sr3Fe2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1589
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