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Applied Physics Letters / Volume 96 / Issue 26 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 96, 263108 (2010); http://dx.doi.org/10.1063/1.3455886 (3 pages)

Nanoscale modulation of electronic states across unit cell steps on the surface of an epitaxial colossal magnetoresistance manganite film

Abhimanyu Rana1,2, Kashinath Bogle3, Onkar Game1, Shankar Patil2, Nagarajan Valanoor3, and Satishchandra Ogale1

1Physical and Materials Chemistry Division, NCL, Pune 411008, India
2Department of Physics, University of Pune, Pune 411007, India
3School of Materials Science and Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia

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(Received 11 March 2010; accepted 22 May 2010; published online 30 June 2010)

The nature of electronic states near the edge of unit cell steps on the surface of epitaxial La0.7Sr0.3MnO3 (LSMO) thin films grown by real-time reflection high energy electron diffraction monitored pulsed laser deposition is examined by scanning tunneling microscopy and scanning tunneling spectroscopy techniques. It is observed that the electronic states are strongly modulated near the step edge with considerably high gap at the edge and low gap on the terrace. This modulation weakens at low temperature. The temperature evolution of the density of states and the nature of gap in deep metallic state of LSMO are also discussed.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

colossal magnetoresistance, electronic density of states, lanthanum compounds, magnetic epitaxial layers, nanostructured materials, pulsed laser deposition, reflection high energy electron diffraction, scanning tunnelling microscopy, scanning tunnelling spectroscopy, strontium compounds

PACS

  • 75.47.Gk

    Colossal magnetoresistance

  • 73.20.At

    Surface states, band structure, electron density of states

  • 81.15.Fg

    Pulsed laser ablation deposition

  • 68.37.Ef

    Scanning tunneling microscopy (including chemistry induced with STM)

  • 75.50.Kj

    Amorphous and quasicrystalline magnetic materials

  • 68.55.-a

    Thin film structure and morphology

  • 75.70.-i

    Magnetic properties of thin films, surfaces, and interfaces

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3455886

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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