Electron tunneling into superconducting filaments using mechanically adjustable barriers

Moreland, John; Ekin, J. W.
July 1985
Applied Physics Letters;7/15/1985, Vol. 47 Issue 2, p175
Academic Journal
A new type of squeezable electron tunneling (SET) junction has been developed for tunneling into superconducting filaments. Stable, mechanically adjustable tunneling barriers between the native surfaces of sputtered Nb films and 30-µm-diam Nb filaments were established in liquid helium at 4 K. The current versus voltage characteristics of these SET junctions were used to determine the superconducting energy gap at the surface of the filaments. Since the filaments were etched from commercial superconducting magnet wire, this type of tunnel junction shows promise as a diagnostic probe of superconducting materials for high-field magnets.


Related Articles

  • Reflectionless tunneling in planar Nb/GaAs hybrid junctions. Giazotto, Francesco; Cecchini, Marco; Pingue, Pasqualantonio; Beltram, Fabio; Lazzarino, Marco; Orani, Daniela; Rubini, Silvia; Franciosi, Alfonso // Applied Physics Letters;3/19/2001, Vol. 78 Issue 12, p1772 

    Reflectionless tunneling was observed in Nb/GaAs superconductor/semiconductor junctions fabricated by a two-step procedure. First, periodic δ-doped layers were grown by molecular-beam epitaxy near the GaAs surface, followed by an As cap layer to protect the surface during ex situ transfer....

  • Multiparticle Tunneling during Field Electron Emission from Bi[sub 2]CaSr[sub 2]Cu[sub 2]O[sub 8]. Maslov, V. I. // Technical Physics Letters;Feb2001, Vol. 27 Issue 2, p153 

    An analysis of data on the experimental statistics of the field electron emission (FEE) from an oxide superconductor of the Bi[sub 2]CaSr[sub 2]Cu[sub 2]O[sub 8] system reveals the multielectron tunneling effect. The spectral curves and statistical data obtained under various experimental...

  • Orientation dependence of proximity effect in ferromagnet/... -wave superconductor junctions. Yang, L. Y.; Zheng, Z. M.; Yu, H. L.; Sun, G. Y.; Xing, D. Y. // European Physical Journal B -- Condensed Matter;Jun2004, Vol. 39 Issue 3, p377 

    The Nambu spinor Green’s function approach is applied to studying the proximity effect in ferromagnet/d-wave superconductor (FM/d-wave SC) junctions. It is found that the magnitude of the proximity effect depends to a great extent on the orientation of the SC crystal with respect to the...

  • Transport properties of ultrathin SrTiO[sub 3] barriers for high-temperature superconductor electronics applications. Morán, 0.; Hott, R.; Schneider, R.; Haibritter, J. // Journal of Applied Physics;11/15/2003, Vol. 94 Issue 10, p6717 

    Current transport through ultrathin SrTiO[sub 3] (STO) barriers has been studied systematically with respect to its dependence on barrier thickness d=2–30 nm, temperature T, and voltage V in state-of-the-art planar YBa[sub 2]Cu[sub 3]O[sub 7-x]/SrTiO[sub 3]/Au (YBCO/STO/Au)...

  • A superconducting tunnel junction x-ray detector with performance limited by statistical effects. le Grand, J. B.; Mears, C. A.; Hiller, L. J.; Frank, M.; Labov, S. E.; Netel, H.; Chow, D.; Friedrich, S.; Lindeman, M. A.; Barfknecht, A. T. // Applied Physics Letters;8/31/1998, Vol. 73 Issue 9 

    We have characterized a thin-film Nb/Al/AlO[sub x]/Al/Nb superconducting tunnel junction (STJ) optimized for low electronic noise as an x-ray detector in the 0.2–1 keV photon energy range. The spectra measured with this junction have high spectral purity with, to the best of our...

  • Entangled electron current through finite size normal-superconductor tunneling structures. Prada, E.; Sols, F. // European Physical Journal B -- Condensed Matter;Aug2004, Vol. 40 Issue 4, p379 

    We investigate theoretically the simultaneous tunneling of two electrons from a superconductor into a normal metal at low temperatures and voltages. Such an emission process is shown to be equivalent to the Andreev reflection of an incident hole. We obtain a local tunneling Hamiltonian that...

  • Location of the minimum of the differential tunneling resistance ... in a superconductor-degenerate semiconductor Schottky contact. Lissitski, M. P.; Naddeo, A.; Nappi, C.; Tagliacozzo, A.; Gubankov, V. N.; Monaco, R.; Russo, M. // European Physical Journal B -- Condensed Matter;Apr2003, Vol. 32 Issue 3, p309 

    : Measurements of differential resistance in a superconductor-degenerate semiconductor junction Nb - n+ +GaAs at T = 1.6 K show close similarity to those for a conventional superconductor-insulator- normal metal junction, except for the position of the minimum which is located at 3.6 meV. Using...

  • Synchronization of underdamped Josephson-junction arrays. Filatrella, G.; Pedersen, N. Falsig; Lobb, C. John; Barbara, P. // European Physical Journal B -- Condensed Matter;Jul2003, Vol. 34 Issue 1, p3 

    Our recent experiments show that arrays of underdamped Josephson junctions radiate coherently only above a threshold number of junctions switched onto the radiating state. For each junction, the radiating state is a resonant step in the current-voltage characteristics due to the interaction...

  • A NEW METHOD TO DETECT COHERENCE LENGTH IN A SUPERCONDUCTOR. BINGQUAN HU; XIAOZHOU LI; ZHENYUN FANG // International Journal of Modern Physics B: Condensed Matter Phys;7/20/2007, Vol. 21 Issue 18/19, p3294 

    The coherence length ξ, which reflects the non-local interactions and ordering scale of superconductive electrons, is one of the characteristic quantities that describe properties of a superconductor. In this paper, we propose a new experiment scheme of measuring coherence length ξ in a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics