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Enhanced Superconductivity in Nanosized Tips of Scanning Tunnelling Microscope

100%

Samuely T., Szabó P., Komanický V., Rodrigo J., Vieira S., Samuely P.

issue 5

1038-1039

Nanosized Pb junctions exhibit superconducting correlations at magnetic fields more than an order of magnitude higher than the zero-temperature critical field of the bulk Pb. The strongly enhanced critical field is a spectacular demonstration of nanosize effect where the Meissner screening currents become ineffective for junction's tip smaller than the London penetration depth (32 nm for Pb). From the enhanced critical field we characterize the geometry of a particular junction using the variable radius pair breaking theoretical model of Suderow et al.

Point Contact Spectroscopy Measurements of Ba(Fe_{0.96}Co_{0.04})_2As_2 Single Crystals

100%

Szabó P., Girovský J., Pribulová Z., Samuely T., Bud'ko S., Canfield P., Samuely P.

issue 5

1045-1046

Point contact spectroscopy results are presented on the electron underdoped Ba(Fe_{0.96}Co_{0.04})_2As_2 single crystals. Two superconducting energy gaps with coupling values 2 Δ_1 ∿ kT_{c} ≈ 2.55 and 2 Δ_2 ∿ kT_{c} ≈ 11 at T_{c} = 15.5 K have been observed in the point contact spectra. The temperature dependence of the normal state background of the point contact spectra observed between T_{c} and T_{N} indicates antiferromagnetic origin of the V-shaped minimum at zero bias.

Superconducting Density of States in B-Doped Diamond

84%

Onufriienko O., Samuely T., Zhang G., Vanacken J., Xu Z., May P., Szabó P., Moshchalkov V., Samuely P.

Acta Physica Polonica A

2017

vol. 131

issue 4

1033-1035

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 2Δ/(k_{B}T_{C}) ratio, which therefore indicates strong coupling.

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3 Acta Physica Polonica A

1 2017

2 2010

3 Samuely P.

3 Samuely T.

3 Szabó P.

1 Bud'ko S.

1 Canfield P.

1 Girovský J.

1 Komanický V.

1 May P.

1 Moshchalkov V.

1 Onufriienko O.

1 Pribulová Z.

1 Rodrigo J.

1 Vanacken J.

1 Vieira S.

1 Xu Z.

1 Zhang G.

Search results

Enhanced Superconductivity in Nanosized Tips of Scanning Tunnelling Microscope

Point Contact Spectroscopy Measurements of Ba(Fe_{0.96}Co_{0.04})_2As_2 Single Crystals

Superconducting Density of States in B-Doped Diamond