Anomalous negative resistance in superconducting vanadium nanowires

Abstract

Low-temperature electrical transport measurements were performed on large arrays of 150-nm-wide superconducting vanadium ͑V͒ wires covered with either a thin layer of Au ͑V/Au͒ or Fe ͑V/Fe͒. The measurements were conducted using various electrical contact geometries. Our results show that a particular arrangement of the electrical contacts in combination with the superconducting proximity effect can result in a pronounced ''negative resistance'' anomaly below the resistive transition. We demonstrate that this ''negative resistance'' can be clearly reproduced by constructing resistor circuits based upon the particular contact arrangement.

Electrodeposited Gd2Zr2O7 and Gd2O3 Buffer Layers for YBa2Cu3O7-δ Superconductors

“…The anomalous negative resistance was due to the particular arrangement of the electrical contacts in combination with the superconducting proximity effect. 11,12 CONCLUSION High-performance PLD YBCO films have been demonstrated on electrodeposited buffer layers. The 300 nm-thick YBCO film shows a high J c of 3.3 MA/cm 2 at 77 K in a self-field.…”

Electronic and magnetic properties of basic nanosystems of early 3d transition metals (Sc, Ti, V, Cr, and Mn)

“…For instance, very recently anti-ferromagnetic linear chains (LCs) of 10 Mn atoms [12] and 6 Mn atoms [13] have been built on a thin insulating layer of copper nitride grown on a Cu (1 0 0) substrate with the help of scanning tunneling microscopy (STM). Very narrow superconducting NWs of V on Au and Fe substrates have been prepared by oblique electron-beam evaporation technique [14]. Ti NWs have been fabricated by methods like STM [15], and electro deposition from a room temperature ionic liquid on graphite step edge [16].…”

Anomalous, hysteretic, transverse magnetoresistance in superconducting thin films with magnetic vortex arrays

“…Thus, the current distribution will change across the phase transition as N regions gradually become S ͑or vice versa͒, and in this situation voltage probes which are not collinear with the overall current flow direction will measure a varying "excess" 14 or "negative" resistance. 15 We developed a simple model to check if these effects can account for the experimental R Ќ versus R ʈ / R N curves shown in Fig. 2͑e͒.…”