Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature

Abstract

\b{eta}-PdBi2 has attracted much attention for its prospective ability to possess simultaneously topological surface and superconducting states due to its unprecedented spin-orbit interaction (SOC). Whereas most works have focused solely on investigating its topological surface states, the coupling between spin and charge degrees of freedom in this class of quantum material remains unexplored. Here we first report a study of spin-to-charge conversion in a \b{eta}-PdBi2 ultrathin film grown by molecular beam epitaxy, utilizing a spin pumping technique to perform inverse spin Hall effect measurements. We find that the room temperature spin Hall angle of Fe/\b{eta}-PdBi2, θ_SH=0.037. This value is one order of magnitude larger than that of reported conventional superconductors, and is comparable to that of the best SOC metals and topological insulators. Our results provide an avenue for developing superconductor-based spintronic applications.

arXiv comment24 pages, 4 figures

References in corpus (31)

• Spintronics: Fundamentals and applications
• Enhanced Gilbert Damping in Thin Ferromagnetic Films
• Topological superconductors: a review
• Superconducting Spintronics
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Topological Crystalline Insulators and Topological Superconductors: From Concepts to Materials
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Fermi level dependent charge-to-spin current conversion by Dirac surface state of topological insulators
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Surface state dominated spin-charge current conversion in topological insulator/ferromagnetic insulator heterostructures
• Tolerance of topological surface states towards magnetic moments: Fe on Bi2Te3 and Bi2Se3
• Observation of inverse spin Hall effect in bismuth selenide
• In-plane magnetic anisotropy of Fe atoms on Bi${}_2$Se${}_3$(111)
• Topologically protected surface states in a centrosymmetric superconductor beta-PdBi2
• Observation of Spin Hall Effect in Weyl Semimetal WTe2 at Room Temperature
• The spin Hall effect of Bi-Sb alloys driven by thermally excited Dirac-like electrons
• Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films
• Spin dynamics in a superconductor / ferromagnet proximity system
• Spin-orbit strength driven crossover between intrinsic and extrinsic mechanisms of the anomalous Hall effect in epitaxial L1o FePd and FePt
• Role of spin mixing conductance in spin pumping: enhancement of spin pumping efficiency in Ta/Cu/Py structures
• Superconductivity at 5.4 K in $\beta$-Bi${}_2$Pd
• Observation of Half-Quantum Flux in Unconventional Superconductor $\beta$-Bi${}_2$Pd
• Spin pumping into superconductors: A new probe of spin dynamics in a superconducting thin film
• Strong evidence for d-electron spin transport at room temperature at a LaAlO3/SrTiO3 interface
• Transport and spin conversion of multi-carriers in semimetal bismuth
• Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments
• Optimizing the spin-pumping induced inverse spin Hall voltage by crystal growth in Fe/Pt bilayers
• Spin transport parameters of NbN thin films characterised by spin pumping experiments
• Chemical doping and high pressure studies of layered beta-PdBi2 single crystals
• Experimental evidence of anomalously large superconducting gap on topological surface state of $\beta$-$\mathbf{B}{\mathbf{i}}_2\mathbf{Pd}$ film
• Transport evidence for three dimensional topological superconductivity in doped $\beta$-PdBi${}_2$

Cited by in corpus (2)

• Superconductivity in PtPb${}_4$ with Possible Nontrivial Band Topology
• Room temperature spin-orbit torque efficiency in sputtered low-temperature superconductor delta-TaN