Weyl fermions and spin dynamics of metallic ferromagnet SrRuO3

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Title
Weyl fermions and spin dynamics of metallic ferromagnet SrRuO3
Author(s)
Shinichi Itoh; Yasuo Endoh; Tetsuya Yokoo; Soshi Ibuka; Je-Geun Park; Yoshio Kaneko; Kei S. Takahashi; Yoshinori Tokura; Naoto Nagaosa
Publication Date
2016-06
Journal
NATURE COMMUNICATIONS, v.7, no., pp.11788 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Weyl fermions that emerge at band crossings in momentum space caused by the spin-orbit interaction act as magnetic monopoles of the Berry curvature and contribute to a variety of novel transport phenomena such as anomalous Hall effect and magnetoresistance. However, their roles in other physical properties remain mostly unexplored. Here, we provide evidence by neutron Brillouin scattering that the spin dynamics of the metallic ferromagnet SrRuO 3 in the very low energy range of milli-electron volts is closely relevant to Weyl fermions near Fermi energy. Although the observed spin wave dispersion is well described by the quadratic momentum dependence, the temperature dependence of the spin wave gap shows a nonmonotonous behaviour, which can be related to that of the anomalous Hall conductivity. This shows that the spin dynamics directly reflects the crucial role of Weyl fermions in the metallic ferromagnet.
URI
https://pr.ibs.re.kr/handle/8788114/3028
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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