Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films

We report on scanning tunneling microscopy/spectroscopy (STM/STS) experiments on (1 1 1)-oriented epitaxial films of heavily boron-doped diamond grown by using the microwave plasma-assisted chemical vapor deposition method. STM/STS measurements were performed by 3He-refrigerator based STM under ultr...

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Main Author: Terukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada and Norio Kobayashi
Format: Article
Language:English
Published: Taylor & Francis Group 2006-01-01
Series:Science and Technology of Advanced Materials
Online Access:http://www.iop.org/EJ/abstract/-search=58672466.7/1468-6996/7/S1/A06
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spelling doaj-7ade9dfe30e04e538ae0164be6d83b072020-11-25T01:05:37ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142006-01-017S1S22Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond filmsTerukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada and Norio KobayashiWe report on scanning tunneling microscopy/spectroscopy (STM/STS) experiments on (1 1 1)-oriented epitaxial films of heavily boron-doped diamond grown by using the microwave plasma-assisted chemical vapor deposition method. STM/STS measurements were performed by 3He-refrigerator based STM under ultra-high vacuum. The STM topography on the film surface shows a corrugation (with a typical size of ~1 μm) and grain-like microstructures (~5–20 nm). The tunneling conductance spectra do not show large spatial dependence and superconductivity is observed independent of the surface structures. The tunneling spectra are analyzed by the Dynes function and the superconducting energy gap is estimated to be Δ=0.87 meV at T=0.47 K, corresponding to 2Δ/kBTc=3.7. The relatively large value of the broadening parameter Γ=0.38 meV is discussed in terms of the inelastic electron scattering processes.http://www.iop.org/EJ/abstract/-search=58672466.7/1468-6996/7/S1/A06
collection DOAJ
language English
format Article
sources DOAJ
author Terukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada and Norio Kobayashi
spellingShingle Terukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada and Norio Kobayashi
Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
Science and Technology of Advanced Materials
author_facet Terukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada and Norio Kobayashi
author_sort Terukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada and Norio Kobayashi
title Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
title_short Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
title_full Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
title_fullStr Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
title_full_unstemmed Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
title_sort scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films
publisher Taylor & Francis Group
series Science and Technology of Advanced Materials
issn 1468-6996
1878-5514
publishDate 2006-01-01
description We report on scanning tunneling microscopy/spectroscopy (STM/STS) experiments on (1 1 1)-oriented epitaxial films of heavily boron-doped diamond grown by using the microwave plasma-assisted chemical vapor deposition method. STM/STS measurements were performed by 3He-refrigerator based STM under ultra-high vacuum. The STM topography on the film surface shows a corrugation (with a typical size of ~1 μm) and grain-like microstructures (~5–20 nm). The tunneling conductance spectra do not show large spatial dependence and superconductivity is observed independent of the surface structures. The tunneling spectra are analyzed by the Dynes function and the superconducting energy gap is estimated to be Δ=0.87 meV at T=0.47 K, corresponding to 2Δ/kBTc=3.7. The relatively large value of the broadening parameter Γ=0.38 meV is discussed in terms of the inelastic electron scattering processes.
url http://www.iop.org/EJ/abstract/-search=58672466.7/1468-6996/7/S1/A06
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