Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet
Abstract
Electrons navigate more easily in a background of ordered magnetic moments than around randomly oriented ones. This fundamental quantum mechanical principle is due to their Bloch wave nature and also underlies ballistic electronic motion in a perfect crystal. As a result, a paramagnetic metal that develops ferromagnetic order often experiences a sharp drop in the resistivity. Despite the universality of this phenomenon, a direct observation of the impact of ferromagnetic order on the electronic quasiparticles in a magnetic metal is still lacking. Here we demonstrate that quasiparticles experience a significant enhancement of their lifetime in the ferromagnetic state of the low-density magnetic semimetal EuCd2As2, but this occurs only in selected bands and specific energy ranges. This is a direct consequence of the magnetically induced band splitting and the multi-orbital nature of the material. Our detailed study allows to disentangle different electronic scattering mechanisms due to non-magnetic disorder and magnon exchange. Such high momentum and energy dependence quasiparticle lifetime enhancement can lead to spin selective transport and potential spintronic applications.
Keywords
Cite
@article{arxiv.2109.08538,
title = {Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet},
author = {Na Hyun Jo and Yun Wu and Thaís V. Trevisan and Lin-Lin Wang and Kyungchan Lee and Brinda Kuthanazhi and Benjamin Schrunk and S. L. Bud'ko and P. C. Canfield and P. P. Orth and Adam Kaminski},
journal= {arXiv preprint arXiv:2109.08538},
year = {2022}
}
Comments
15 pages, 4 figures + supplement