Critical currents in superconducting single crystal niobium diselenide

Magnetic switching of phase-slip dissipation inNbSe2nanoribbons

“…Measurements on multiple NbSe 2 nanobelt samples showed that the Falk, Deshmukh, et al 4 superconducting transition temperature T C of NbSe 2 nanobelts typically ranged between 2 to 2.3 K, lower than bulk values (T C,bulk = 7 K). 16 Previous studies have shown that Se impurities resulting from the incomplete conversion of NbSe 3 to NbSe 2 suppresses T C . 16 Figure 2(a) shows the basic I-V characteristic of device A at T = 1.7 K (T C = 2.1 K for this nanobelt).…”

“…16 Previous studies have shown that Se impurities resulting from the incomplete conversion of NbSe 3 to NbSe 2 suppresses T C . 16 Figure 2(a) shows the basic I-V characteristic of device A at T = 1.7 K (T C = 2.1 K for this nanobelt). At low I, the V drop across the nanobelt is small but nonzero and increases with I.…”

“…The thickness (d) and width (w) of typical NbSe 2 nanobelts are ~100 nm, indicating that ξ(T = 0) < d,w ~ λ (T = 0). 15,16 Devices incorporating individual NbSe 2 nanobelts were fabricated by suspending the nanobelts in isopropanol, depositing them on a SiO x or AlN substrate, and contacting them to bonding pads using conventional electron-beam lithography followed by sputtering of 60-nm Cr and 200-nm Au layers. Immediately before sputtering, the nanobelts were cleaned with an Ar plasma in the sputtering chamber.…”

Evidence for possible interaction between CDW and magnetic vortices in 2H-NbSe2 : comparison with 2H-NbS2

“…to depin the vortices) varies non-monotonically with field. While such has not been investigated in NbS2, the proposed explanations of this effect, involving an increase of pinning as the FLL shear modulus, C6@ decreases near TC [14], should also hold for the sulfide, and in any case, it is not clear how the critical state peak effect is related to the relatively smaller vortex motions we are probing. (The reed vibration amplitudes are typically <looA.…”

“…NbSe;! has a well documented "peak effect [14], in which the critical current (i.e. to depin the vortices) varies non-monotonically with field.…”