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Title: Pinhole mediated electrical transport across LaTiO{sub 3}/SrTiO{sub 3} and LaAlO{sub 3}/SrTiO{sub 3} oxide hetero-structures

Metal-insulator-metal configuration of LaTiO{sub 3}/SrTiO{sub 3} and LaAlO{sub 3}/SrTiO{sub 3} hetero-structures between two dimensional electron gas formed at the interface and different area top electrodes is employed for Conductive Atomic force microscopy (CAFM) imaging, Current–Voltage (I-V), and Capacitance-Voltage (C-V) spectroscopy. Electrode area dependent I-V characteristics are observed for these oxide hetero-structures. With small area electrodes, rectifying I-V characteristics are observed, compared to, both tunneling and leakage current characteristics for large area electrodes. CAFM mapping confirmed the presence of pinholes on both surfaces. Resultant I-V characteristics have a contribution from both tunneling and leakage due to pinholes.
Authors:
; ;  [1]
  1. Quantum Phenomena and Applications Division, National Physical Laboratory, New Delhi 110012 (India)
Publication Date:
OSTI Identifier:
22254026
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 21; Other Information: (c) 2013 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; 36 MATERIALS SCIENCE; ALUMINATES; ATOMIC FORCE MICROSCOPY; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; ELECTRODES; ELECTRON GAS; LANTHANUM COMPOUNDS; LEAKAGE CURRENT; OXIDES; SPECTROSCOPY; STRONTIUM TITANATES; TUNNEL EFFECT