Low-temperature STM/STS studies on boron-doped (1 1 1) diamond films

Nishizaki, Terukazu; Takano, Yoshihiko; Nagao, Masanori; Takenouchi, T.; Kawarada, Hiroshi; Kobayashi, Norio

doi:10.1016/j.jpcs.2008.06.011

Cited by 7 publications

(10 citation statements)

References 24 publications

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“…3). This is in steep contrast with previous studies on polycrystalline samples [11][12][13][14]. To our knowledge, such homogeneous hard gap was observed only in the case of a single crystal [15].…”

Section: O Onufriienko Et Alcontrasting

confidence: 99%

“…2, the superconducting gap in the density of states is gradually suppressed with increase of temperature and the estimated superconducting critical temperature T c = 7 ± 0.5 K. Such measurements were performed at numerous locations across the sample surface, yielding identical results within experimental error. We did not observe any spatial variation of SDOS as reported in previous studies of polycrystalline boron doped diamond [11][12][13][14]. Notably, the value of the differential conductance inside the superconducting gap is equal to zero (see Fig.…”

Section: O Onufriienko Et Alsupporting

confidence: 77%

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Superconducting Density of States in B-Doped Diamond

et al. 2017

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In the presented work, we investigated the superconducting boron doped diamond polycrystalline film prepared by chemical vapor deposition by means of scanning tunneling microscopy/spectroscopy. Differential conductance spectra measured at various temperatures were used to obtain the values of superconducting critical temperature and energy gap. Comparing various theoretical models fitted to the differential conductance spectra measured at 0.5 K suggests weak pair breaking. However, this cannot account for the high 2∆ k B T C ratio, which therefore indicates strong coupling.

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Section: O Onufriienko Et Alcontrasting

confidence: 99%

Section: O Onufriienko Et Alsupporting

confidence: 77%

Superconducting Density of States in B-Doped Diamond

et al. 2017

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“…2͑a͒ and 2͑b͒ suggests that these facets also have an inhomogeneous distribution of n B . Here, it is important to discuss the following: recent STM studies 28 on boron-doped single-crystalline films show that although having the samples an inhomogeneous boron incorporation, revealed by the difference in the spectra measured over different points at T ϳ T C , the superconducting ⌬ was spatially homogeneous at T Ӷ T C . Since at 0.1 K Ӷ T C ⌬ also varies on the single-crystalline facets of the NCD grains of sample s3, the difference between our results and those reported in Ref.…”

Section: Intrinsic Granularitymentioning

confidence: 99%

Intrinsic granularity in nanocrystalline boron-doped diamond films measured by scanning tunneling microscopy

et al. 2009

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We report on low-temperature scanning tunneling microscopy/spectroscopy experiments performed on superconducting boron-doped nanocrystalline diamond ͑NCD͒ thin films prepared by chemical-vapor deposition methods. The most representative sample reveals the observed superconducting gap ͑⌬͒ highly modulated over a length scale on the order of ϳ30 nm, which is much shorter than the typical diamond grain size. The sample local and macroscopic behavior favors for the ⌬ modulation as being an intrinsic property of the NCD granules. On the other hand, ⌬ shows its temperature dependence ͓⌬͑T͔͒ consistent with the results obtained by Fominov and Feigel'man ͓Phys. Rev. B 63, 094518 ͑2001͔͒, who studied theoretically the behavior of the superconducting gap of a BCS superconductor in contact with a normal layer by solving the one-dimensional Usadel equations on the superconducting side of the superconducting to normal interface.

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“…Hydrogen efficiently etches non-diamond carbons leaving much cleaner surface compared to HPHT growth. This might explain much better, high-resolution STM images obtained on CVD rather than HPHT samples [34][35][36]. In particular, STM/STS mapping of CVD films reveals homogeneous spatial distribution of superconducting current [34][35][36], contrary to inhomogeneities observed in HPHT samples [24].…”

Section: Synthesis and Dopingmentioning

confidence: 99%

“…This might explain much better, high-resolution STM images obtained on CVD rather than HPHT samples [34][35][36]. In particular, STM/STS mapping of CVD films reveals homogeneous spatial distribution of superconducting current [34][35][36], contrary to inhomogeneities observed in HPHT samples [24]. Homoepitaxial CVD diamond is also superior to HPHT diamond in terms of the bulk quality [37].…”

Section: Synthesis and Dopingmentioning

confidence: 99%

Superconductivity in covalent semiconductors

Iakoubovskii

2009

Open Physics

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Abstract:This review covers recent advances in superconductivity of diamond, Si, SiC, group III-V and II-IV semiconductors, metal-intercalated graphite and fullerites. The results are critically analyzed and prospects are given for future research directions. In particular, it is argued that the highest transition temperatures of ∼9 K in diamond and 11.5 K in CaC 6 can further be enhanced and that no reliable evidence exists yet for superconductivity in III-V semiconductors.PACS (2008)

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Low-temperature STM/STS studies on boron-doped (1 1 1) diamond films

Cited by 7 publications

References 24 publications

Superconducting Density of States in B-Doped Diamond

Superconducting Density of States in B-Doped Diamond

Intrinsic granularity in nanocrystalline boron-doped diamond films measured by scanning tunneling microscopy

Superconductivity in covalent semiconductors

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