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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]
Copyright of International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 9706483
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Scanning Tunneling Spectrocopy on MgB[sub 2] Thin Films.
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  Data: <searchLink fieldCode="AR" term="%22Bobba%2C+F%2E%22">Bobba, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Lamy%2C+R%2E%22">Lamy, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Roditchev%2C+D%2E%22">Roditchev, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Sacks%2C+W%2E%22">Sacks, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Klein%2C+J%2E%22">Klein, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Ferrando%2C+V%2E%22">Ferrando, V.</searchLink><br /><searchLink fieldCode="AR" term="%22Ferdeghini%2C+C%2E%22">Ferdeghini, C.</searchLink><br /><searchLink fieldCode="AR" term="%22Giubileo%2C+F%2E%22">Giubileo, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Cucolo%2C+A%2E+M%2E%22">Cucolo, A. M.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Modern+Physics+B%3A+Condensed+Matter+Physics%3B+Statistical+Physics%3B+Applied+Physics%22">International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics</searchLink>. 3/10/2003, Vol. 17 Issue 4-6, p446. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Scanning+tunneling+microscopy%22">Scanning tunneling microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Superconductivity%22">Superconductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+diboride%22">Magnesium diboride</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink>
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  Data: 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]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1142/S021797920301608X
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        Text: English
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      – SubjectFull: Superconductivity
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      – SubjectFull: Magnesium diboride
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      – SubjectFull: Thin films
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              Text: 3/10/2003
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