STS study of the local density of states in MgB2 thin films
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| Title: | STS study of the local density of states in MgB |
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| Authors: | Giubileo, F.1 cucolo@sa.infn.it, Bobba, F.1, Roditchev, D.2, Cucolo, A.M.1 |
| Source: | Journal of Physics & Chemistry of Solids. Jan2006, Vol. 67 Issue 1-3, p357-359. 3p. |
| Subjects: | Thin films, Scanning tunneling microscopy, Solid state electronics, Magnetic fields |
| Abstract: | 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 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 ∼±4.7 and ∼±8.3meV. 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 Δ π at low fields was found, while the 2D energy gap Δ σ seems to be not strongly affected by magnetic fields up to 2.6T. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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