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Scanning Tunneling Spectrocopy on MgB[sub 2] Thin Films.

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Title: Scanning Tunneling Spectrocopy on MgB[sub 2] Thin Films.
Authors: Bobba, F., Lamy, R., Roditchev, D., Sacks, W., Klein, J., Ferrando, V., Ferdeghini, C., Giubileo, F., Cucolo, A. M.
Source: International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics. 3/10/2003, Vol. 17 Issue 4-6, p446. 7p.
Subjects: Scanning tunneling microscopy, Superconductivity, Magnesium diboride, Thin films
Abstract: Low temperature Scanning Tunneling Microscopy/Spectroscopy (STM/STS) was used to study the superconducting properties of as grown MgB[SUB2] thin films. Two different Pulsed Laser Ablation deposition procedures were used to fabricate the samples. Depending on growth conditions, STS/STM analysis revealed either superconducting or normal metallic behavior on the sample surfaces. In the first case the tunneling spectra with well-pronounced superconducting gap of 2.6-3.2 meV were observed at T = 4.2 K. STS spectra were found to be position independent, thus showing a very high spatial homogeneity of the films. No evidence of double gap structures was found. Moreover, in contrast with a bulk T[SUBC] = 35.7K of the samples, the superconductivity with a damped T[SUBC] was observed on the surface. In the second case, the superconducting features were completely absent in the tunneling spectra. We associate such a behaviour of the samples of second type with the presence of a thick metallic cap layer all over the surface. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Low temperature Scanning Tunneling Microscopy/Spectroscopy (STM/STS) was used to study the superconducting properties of as grown MgB[SUB2] thin films. Two different Pulsed Laser Ablation deposition procedures were used to fabricate the samples. Depending on growth conditions, STS/STM analysis revealed either superconducting or normal metallic behavior on the sample surfaces. In the first case the tunneling spectra with well-pronounced superconducting gap of 2.6-3.2 meV were observed at T = 4.2 K. STS spectra were found to be position independent, thus showing a very high spatial homogeneity of the films. No evidence of double gap structures was found. Moreover, in contrast with a bulk T[SUBC] = 35.7K of the samples, the superconductivity with a damped T[SUBC] was observed on the surface. In the second case, the superconducting features were completely absent in the tunneling spectra. We associate such a behaviour of the samples of second type with the presence of a thick metallic cap layer all over the surface. [ABSTRACT FROM AUTHOR]
ISSN:02179792
DOI:10.1142/S021797920301608X