Superconducting properties of vanadium films

Abstract

Studies on superconducting thin films of vanadium for determining the influence of production parameters are performed. The critical temperature Tc is determined as a function of the film thickness and the dependence of the critical magnetic field Hc∥ and Hc⟂ on the reduced temperature is measured. Moreover the dependence of the critical magnetic field and the critical current density on the angle are measured and the film constants λ, ξ, and x are determined. The experimental values are compared with values, which are calculated from the Ginsburg‐Landau theory.

Interfacial spin-orbit coupling: A platform for superconducting spintronics

“…3(b)-3(d) we can rule out that MAAR is a trivial effect due to the induced vortices with an applied magnetic field. The observed MAAR also substantially exceeds the possible effect of the fringing fields from the Fe region on V film separated by MgO, as evaluated from micromagnetic simulations using the MuMax 3 code [39] (less than 20 Oe in the central region and less than 150 Oe near the edges, still less than H C1 for V [40,41]). We verify on a control all-epitaxial Au/MgO/V junction that applying a perpendicular magnetic field in the amount of these calculated fringing fields changes the measured conductance by less than 1%.…”

Graphene Membrane as Suspended Mask for Lithography

“…Secondly, excessive heating during evaporation can lead to the deformation of the surface of the polymer (the melting point of PMMA is~110°C), ruining the design of the device and degassing impurities from the mask. This issue occurs, for example, in realizing superconductive mesoscopic devices, which require the deposition of refractory metals (e.g., Nb [9] or V [10]); a consequence of the damage of the mask is the suppression of superconductivity and the increase in the residual resistance ratio of some types of films [11].…”