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Characterization of off-axis MgB2 epitaxial thin films for planar junctions

Appl. Phys. Lett. 87, 242506 (2005); doi:10.1063/1.2140473

Published 6 December 2005

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M. Iavarone, G. Karapetrov, A. Menzel, V. Komanicky, H. You, and W. K. Kwok
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

P. Orgiani
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802 and University of Naples, INFM-Coherentia, Naples I-80125, Italy

V. Ferrando
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802 and University of Genoa, INFM-LAMIA, Genoa 16146, Italy

X. X. Xi
Department of Physics and Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
Using scanning tunneling spectroscopy, we perform a full mapping of the quasiparticle density of states of magnesium diboride (MgB2) epitaxial thin films grown on (110) yttrium stabilized zirconia (YSZ) by hybrid physical-chemical vapor deposition. The films have critical temperatures of 40 K. X-ray measurements show an epitaxial MgB2 growth having the c-axis tilted by 32° with respect to the normal to the substrate, consistent with the atomic force microscopy images of the sample. Scanning tunneling spectroscopy clearly finds that the spectroscopic peak associated to the pi gap is reduced on most of the film surface and the feature representative of the sigma gap is present, with different intensity, on the majority of the sample's surface, which is consistent with x-ray measurements. ©2005 American Institute of Physics
History: Received 9 June 2005; accepted 11 October 2005; published 6 December 2005
Permalink: http://link.aip.org/link/?APPLAB/87/242506/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.78.Bz
    High-Tc superconducting films
  • 74.70.Ad
    Superconducting metals; alloys and binary compounds (including A15, MgB2, etc.)
  • 74.25.Fy
    Transport properties of superconductors including electric and thermal conductivity, thermoelectric effects, etc
  • 74.25.Jb
    Electronic structure of superconductors
  • 68.55.Jk
    Thin film structure and morphology; thickness; crystalline orientation and texture
  • YEAR: 2005

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ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (13)
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