Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet

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2021-12-09
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Jo, Na Hyun
Trevisan, Thaís V.
Wang, Lin-Lin
Lee, Kyungchan
Kuthanazhi, Brinda
Schrunk, Benjamin
Bud'ko, Sergey L.
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Iowa State University Digital Repository, Ames IA (United States)
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Physics and AstronomyAmes National LaboratoryMaterials Science and Engineering
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.
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This article is published as Jo, Na Hyun, Yun Wu, Thaís V. Trevisan, Lin-Lin Wang, Kyungchan Lee, Brinda Kuthanazhi, Benjamin Schrunk et al. "Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet." Nature Communications 12, no. 1 (2021): 1-7. DOI: 10.1038/s41467-021-27277-6. DOE Contract Number(s): AC02-07CH11358. Posted with permission.
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