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1
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Strong-Coupling Features in YB_6 and ZrB_{12} Studied by Point-Contact Spectroscopy

100%
Girovský J., Szabó P., Mori T., Samuely P.
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issue 5
1042-1044
EN
Point-contact spectroscopy studies of the superconducting energy gap and the electron-phonon coupling mechanism are performed on the boron rich YB_6 and ZrB_{12} single crystals. The obtained values of the superconducting energy gaps suggest the strong coupling with 2 Δ/k_{B}T_{c}≈ 4.2 for YB_6 and 2 Δ/k_{B}T_{c}≈ 4.15 for ZrB_{12}. We have observed the dominant soft phonon modes mediating superconductivity in the both samples at energy ≈ 8 meV for YB_6 and ≈ 11 meV in ZrB_{12}, respectively.
2
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Superconductivity Near Transition to Insulating State in MoC Ultrathin Films Studied by Subkelvin STM

88%
Szabó P., Neilinger P., Trgala M., Grajcar M., Samuely P.
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vol. 126
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issue 1
368-369
EN
We study the homogeneously disordered MoC thin films with thicknesses of 10 and 5 nm and the superconducting transition temperatures near 6 and 4 K, significantly decreased as compared to the bulk T_{c}=8.32 K due to a disorder. The scanning tunnelling spectroscopy reveals in the thicker sample a BCS superconducting energy gap Δ with a broadening parameter Γ equal to about 10 per cent of Δ. Remarkably, Γ increases with temperature. The thinner, more disordered sample shows a gapped superconducting density of states but without any coherence peaks at the gap edge, which could not be approximated by the BCS DOS. Moreover, the reduced DOS around the Fermi level persists above the resistive transition temperature reminding the pseudo-gap known from high-T_{c} cuprates.
3
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Enhanced Superconductivity in Nanosized Tips of Scanning Tunnelling Microscope

76%
Samuely T., Szabó P., Komanický V., Rodrigo J., Vieira S., Samuely P.
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issue 5
1038-1039
EN
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.
4
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Point Contact Spectroscopy Measurements of Ba(Fe_{0.96}Co_{0.04})_2As_2 Single Crystals

76%
Szabó P., Girovský J., Pribulová Z., Samuely T., Bud'ko S., Canfield P., Samuely P.
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issue 5
1045-1046
EN
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.
5
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Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys

76%
Hašková V., Szabó P., Kováč J., Ryba T., Vargová Z., Varga R.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
377-378
EN
The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co₂CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co₂CrAl and Co₂Cr_{0.6}Fe_{0.4}Al ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for Co₂Cr_{0.6}Fe_{0.4}Al. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of Co₂Cr_{0.6}Fe_{0.4}AlP₀ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in Co₂Cr_{1-x}FeₓAl Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.
6
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Superconducting Density of States in B-Doped Diamond

64%
Onufriienko O., Samuely T., Zhang G., Vanacken J., Xu Z., May P., Szabó P., Moshchalkov V., Samuely P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1033-1035
EN
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.
7
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Point-Contact Spectroscopy of Superconducting MgCNi_3 Single Crystals

64%
Pribulová Z., Szabó P., Kačmarčík J., Samuely P., Jang D., Lee H., Lee H., Lee S.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
215-218
EN
The first point-contact spectroscopy measurements on MgCNi_3 single crystals of very good quality are presented. The measurements have been performed in the temperature range from 1.5 K up to 10 K and at magnetic fields up to 6 T. The superconducting energy gap Δ of the system is found to be scattered between 1 and 1.2 meV which gives the 2Δ/k T_c ratio between BCS weak-coupling value of ~3.5 and a strong coupling of about 4.2. The excess current evaluated in magnetic field indicates the presence of a single energy gap.
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