skip to main content

SciTech ConnectSciTech Connect

Title: Ex situ elaborated proximity mesoscopic structures for ultrahigh vacuum scanning tunneling spectroscopy

We apply ultrahigh vacuum Scanning Tunneling Spectroscopy (STS) at ultra-low temperature to study proximity phenomena in metallic Cu in contact with superconducting Nb. In order to solve the problem of Cu-surface contamination, Cu(50 nm)/Nb(100 nm) structures are grown by respecting the inverted order of layers on SiO{sub 2}/Si substrate. Once transferred into vacuum, the samples are cleaved at the structure-substrate interface. As a result, a contamination-free Cu-surface is exposed in vacuum. It enables high-resolution STS of superconducting correlations induced by proximity from the underlying superconducting Nb layer. By applying magnetic field, we generate unusual proximity-induced superconducting vortices and map them with a high spatial and energy resolution. The suggested method opens a way to access local electronic properties of complex electronic mesoscopic devices by performing ex situ STS under ultrahigh vacuum.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ; ; ;  [1] ;  [2] ;  [4] ;  [3] ;  [5] ;  [6] ;  [1] ;  [2] ;  [2]
  1. UMR 7588, Institut des Nanosciences de Paris, UPMC Univ Paris 06, Sorbonne Universités, F-75005 Paris (France)
  2. (France)
  3. (Russian Federation)
  4. Université de Bordeaux, LP2N, 351 cours de la Libération, F-33405 Talence (France)
  5. Institute of Solid State Physics RAS, 142432 Chernogolovka (Russian Federation)
  6. LLC “Applied radiophysics” 142432 Chernogolovka (Russian Federation)
Publication Date:
OSTI Identifier:
22267712
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COPPER; ENERGY RESOLUTION; MAGNETIC FIELDS; NIOBIUM; SILICON OXIDES; SPECTROSCOPY; SURFACE CONTAMINATION; TUNNEL EFFECT