Multiple magnon modes in the Co3Sn2S2Weyl semimetal candidate

O. O. Shvetsov; V. D. Esin; A. V. Timonina; N. N. Kolesnikov; E. V. Deviatov

doi:10.1209/0295-5075/127/57002

All issues

Volume 127 / No 5 (September 2019)

EPL, 127 5 (2019) 57002

Abstract

Issue		EPL Volume 127, Number 5, September 2019


Article Number		57002
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/127/57002
Published online		10 October 2019

EPL, 127 (2019) 57002

Multiple magnon modes in the Co₃Sn₂S₂Weyl semimetal candidate

O. O. Shvetsov , V. D. Esin , A. V. Timonina, N. N. Kolesnikov and E. V. Deviatov

Institute of Solid State Physics of the Russian Academy of Sciences - 2 Academician Ossipyan str., 142432 Chernogolovka, Moscow District, Russia

Received: 28 June 2019
Accepted: 29 August 2019

Abstract

We experimentally investigate electron transport in the kagome-lattice ferromagnet Co₃Sn₂S₂, which is regarded as a time-reversal symmetry broken Weyl semimetal candidate. We demonstrate $\mathrm{d}V/\mathrm{d}I(I)$ curves with pronounced asymmetric $\mathrm{d}V/\mathrm{d}I$ spikes, similar to those attributed to current-induced spin-wave excitations in ferromagnetic multilayers. In contrast to multilayers, we observe several $\mathrm{d}V/\mathrm{d}I$ spikes' sequences at low, ${\approx}10^4\ \text{A/cm}^{2}$ , current densities for a thick single-crystal Co₃Sn₂S₂ flake in the regime of fully spin-polarized bulk. The spikes at low current densities can be attributed to novel magnon branches in magnetic Weyl semimetals, which are predicted due to the coupling between two magnetic moments mediated by Weyl fermions. The presence of spin-transfer effects at low current densities in Co₃Sn₂S₂ makes the material attractive for applications in spintronics.

PACS: 73.23.-b – Electronic transport in mesoscopic systems / 73.40.-c – Electronic transport in interface structures

© EPLA, 2019

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