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STS study of the local density of states in MgB2 thin films (Articolo in rivista)
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- STS study of the local density of states in MgB2 thin films (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Alternative label
Giubileo, F; Bobba, F; Roditchev, D; Cucolo, AM (2006)
STS study of the local density of states in MgB2 thin films
in Journal of physics and chemistry of solids
(literal)
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- Giubileo, F; Bobba, F; Roditchev, D; Cucolo, AM (literal)
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- ISI Web of Science (WOS) (literal)
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- Univ Salerno, Dept Phys, I-84081 Baronissi, Italy; Univ Salerno, INFM, SUPERMAT Lab, I-84081 Baronissi, Italy; Univ Paris 06, Phys Solides Grp, F-75251 Paris, France; Univ Paris 07, CNRS, UMR 75 88, F-75251 Paris 5, France (literal)
- Titolo
- STS study of the local density of states in MgB2 thin films (literal)
- Abstract
- We have performed an extensive Scanning Tunnelling Spectroscopy study on c-axis oriented MgB2 thin films. By approaching a mechanically etched Pt/Ir tip, we realized S-I-N vacuum junctions. Only the 3D energy gap Delta(pi) =2.7 meV was observed, appearing spatially homogeneous all over the sample surface. We also produced S-I-S junctions by capturing a small MgB2 grain as STM tip. In these cases, the tunnelling spectra showed four coherence peaks at energies similar to +/- 4.7 and similar to +/- 8.3 meV. We finally investigated the magnetic field dependence of the double structures observed in the S-I-S configuration: a rapid reduction of the 3D energy gap Delta(pi) at low fields was found, while the 2D energy gap Delta(sigma) seems to be not strongly affected by magnetic fields up to 2.6 T. (c) 2005 Elsevier Ltd. All rights reserved. (literal)
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