Ultralow-energy magnon anomaly in yttrium iron garnet

Shin Ichi Shamoto, Yukio Yasui, Masato Matsuura, Mitsuhiro Akatsu, Yoshiaki Kobayashi, Yuichi Nemoto, Jun'ichi Ieda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Ultralow-lying magnon energy spectrum in yttrium iron garnet (YIG) has been studied by inelastic neutron scattering in an energy range from 10 to 45 μeV. When a magnetic field of approximately 0.1 T was applied along [111] direction, ultralow-energy magnon anomaly was found at 10 K, suggesting the closure of the Zeeman energy gap. The anomaly was also observed in the temperature dependence of magnetization under a magnetic field along the [111] direction below 30 K. The specific heat capacity confirms the closure of the Zeeman energy gap at the magnetic field direction. All these anomalies strongly support the magnetic crossover below 30 K under the magnetic field along [111], in addition to a precursor anomaly below 150 K.

Original languageEnglish
Article number033235
JournalPhysical Review Research
Volume2
Issue number3
DOIs
Publication statusPublished - 2020 Aug

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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