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Title: Electronic transport transition at graphene/YBa{sub 2}Cu{sub 3}O{sub 7−δ} junction

We report the fabrication of graphene/YBa{sub 2}Cu{sub 3}O{sub 7−δ} contacts and their superconducting proximity effect. Both the temperature dependence of resistance and the current bias dependence of resistance for the contacts are investigated, respectively. The results are compared with that of pure YBCO Hall bar. It is found that the differential resistance transits from a non-zero value to zero at high bias across graphene/YBCO junction below the transition temperature of YBCO, the phenomena indicate the tunneling of Cooper pairs from YBCO to graphene. As the YBCO film deposited by pulsed laser deposition has a rough surface, the graphene layer can contact with the edge of CuO{sub 2} planes. It allows that Cooper pairs could leak into graphene along the CuO{sub 2} planes.
Authors:
;  [1] ;  [2] ; ; ; ;  [3] ; ;  [1]
  1. School of Physics and Electronics, Central South University, Changsha 410083 (China)
  2. (China)
  3. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050 (China)
Publication Date:
OSTI Identifier:
22257053
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM OXIDES; COOPER PAIRS; COPPER OXIDES; ENERGY BEAM DEPOSITION; GRAPHENE; HIGH-TC SUPERCONDUCTORS; PROXIMITY EFFECT; TEMPERATURE DEPENDENCE; TUNNEL EFFECT; YTTRIUM OXIDES