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MA: Fachverband Magnetismus

MA 63: Spin: Transport, Orbitronics and Hall Effects III

MA 63.2: Vortrag

Freitag, 20. März 2020, 09:45–10:00, HSZ 403

Spin-dependent transport in Uranium — •Ming-Hung Wu, Hugo Rossignol, and Martin Gradhand — H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom

Uranium, a naturally occurring heavy metal with 5f-electrons, has been investigated for decades due to its complex properties.1 Despite its narrow 5f-bands, the hybridization with 6d-bands provides itinerant electrons, distinct from other 5f actinides. In combination with its strong spin-orbit coupling, uranium is a promising material for spintronic applications e.g. magnetic multilayer systems.2-5 Furthermore uranium crystallizes in a large variety of structures such as α (orthorhombic), β (bct), γ (bcc) and hcp phase, it shows superconductivity and is close to a ferromagnetic transition. In order to shed light on the complex physics in such systems, we focus on the spin-dependent transport of uranium for a variety of phases. In our ab initio calculations we analyze the intrinsic spin Hall effect as well as the extrinsic mechanism incorporating various impurities for bulk γ, hcp and α uranium. We discuss the effects of crystal structures and magnetic moments of impurities on the spin-dependent transport.

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