Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet

Na Hyun Jo, Yun Wu, Thaís V. Trevisan, Lin-Lin Wang, Kyungchan Lee, Brinda Kuthanazhi, Benjamin Schrunk, S. L. Bud’ko, P. C. Canfield, P. P. Orth and Adam Kaminski ()
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Na Hyun Jo: Ames Laboratory
Yun Wu: Ames Laboratory
Thaís V. Trevisan: Ames Laboratory
Lin-Lin Wang: Ames Laboratory
Kyungchan Lee: Ames Laboratory
Brinda Kuthanazhi: Ames Laboratory
Benjamin Schrunk: Ames Laboratory
S. L. Bud’ko: Ames Laboratory
P. C. Canfield: Ames Laboratory
P. P. Orth: Ames Laboratory
Adam Kaminski: Ames Laboratory

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-27277-6

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