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Title: Anisotropic strain induced directional metallicity in highly epitaxial LaBaCo 2O 5.5+δ thin films on (110) NdGaO 3

Highly directional-dependent metal-insulator transition is observed in epitaxial double perovskite LaBaCo 2O 5.5+δ films. The film exhibit metallic along [100], but remain semiconducting along [010] under application of a magnetic field parallel to the surface of the film. The physical origin for the properties is identified as in-plane tensile strain arising from oxygen vacancies. First-principle calculations suggested the tensile strain drastically alters the band gap, and the vanishing gap opens up [100] conduction channels for Fermi-surface electrons. Lastly, our observation of strain-induced highly directional-dependent metal-insulator transition may open up new dimension for multifunctional devices.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [6] ;  [7] ;  [4]
  1. Xi'an Jiaotong Univ., Shaanxi (People's Republic of China); Univ. of Texas, San Antonio, TX (United States)
  2. Chinese Academy of Sciences, Changchun (People's Republic of China); Rensselaer Polytechnic Inst., Troy, NY (United States)
  3. Xi'an Jiaotong Univ., Shaanxi (People's Republic of China)
  4. Univ. of Texas, San Antonio, TX (United States)
  5. Univ. of Electronic Science and Technology of China, Sichuan (People's Republic of China)
  6. Univ. of Texas, Arlington, TX (United States)
  7. Rensselaer Polytechnic Inst., Troy, NY (United States)
Publication Date:
Grant/Contract Number:
FE0003780; SC0002623
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Texas, San Antonio, TX (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electronic properties and materials; magnetic properties and materials
OSTI Identifier:
1361203