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Title: Thickness-dependent metal-insulator transition in epitaxial SrRuO{sub 3} ultrathin films

Transport characteristics of ultrathin SrRuO{sub 3} films, deposited epitaxially on TiO{sub 2}-terminated SrTiO{sub 3} (001) single-crystal substrates, were studied as a function of film thickness. Evolution from a metallic to an insulating behavior is observed as the film thickness decreases from 20 to 4 unit cells. In films thicker than 4 unit cells, the transport behavior obeys the Drude low temperature conductivity with quantum corrections, which can be attributed to weak localization. Fitting the data with 2-dimensional localization model indicates that electron-phonon collisions are the main inelastic relaxation mechanism. In the film of 4 unit cells in thickness, the transport behavior follows variable range hopping model, indicating a strongly localized state. Magnetoresistance measurements reveal a likely magnetic anisotropy with the magnetic easy axis along the out-of-plane direction.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3] ;  [4]
  1. National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, College of Engineering and Applied Science, and Collaborative Center of Advanced Materials, Nanjing University, Nanjing 210093 (China)
  2. (United States)
  3. Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  4. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstr, 400, 01328 Dresden (Germany)
Publication Date:
OSTI Identifier:
22399236
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 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; ANISOTROPY; CORRECTIONS; ELECTRONS; EPITAXY; MAGNETORESISTANCE; METALS; MONOCRYSTALS; PHONONS; RELAXATION; RUTHENIUM OXIDES; STRONTIUM TITANATES; SUBSTRATES; THICKNESS; THIN FILMS; TITANIUM OXIDES; TWO-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL SYSTEMS