Search

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 curves with pronounced asymmetric spikes, similar to those attributed to current-induced spin-wave excitations in ferromagnetic multilayers. In contrast to multilayers, we observe several spikes' sequences at low, , 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. [ABSTRACT FROM AUTHOR]

Strong electron-electron interactions in dilute two-dimensional electron systems in silicon lead to Pauli spin susceptibility growing critically at low electron densities. This effect originates from renormalization of the effective mass rather than the g-factor. The relative mass enhancement is system and disorder independent, which suggests that it is determined by electron-electron interactions only. [ABSTRACT FROM AUTHOR]