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8 papers · 2 filters
Proximity-induced screening and its magnetic breakdown in mesoscopic hybrid structures
A. V. Galaktionov, A. D. Zaikin
We derive a general microscopic expression for the non-linear diamagnetic current in a clean superconductor-insulator-normal metal structure with an arbitrary interface transmissio…
Independent determination of the two gaps by directional point-contact spectroscopy in MgB_2 single crystals
R. S. Gonnelli, D. Daghero, G. A. Ummarino +4
Directional point-contact spectroscopy measurements were performed for the first time in state-of-the-art MgB_2 single crystals. The selective suppression of the superconductivity…
Josephson Current in S-FIF-S Junctions: Nonmonotonic Dependence on Misorientation Angle
Yu. S. Barash, I. V. Bobkova, T. Kopp
Spectra and spin structures of Andreev interface states in S-FIF-S junctions are investigated with emphasis on finite transparency and misorientation angle between in-plane magneti…
Electromagnetic response of superconductors and optical sum rule
A. E. Karakozov, E. G. Maksimov, O. V. Dolgov
The interrelation between the condensation energy and the optical sum rules has been investigated. It has been shown that the so called 'partial' sum rule violation is related main…
Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
R. S. Gonnelli, D. Daghero, G. A. Ummarino +4
We present the results of the first directional point-contact spectroscopy experiments in high-quality MgB_2 single crystals. Due to the directionality of the current injection int…
First and second order phase transitions and magnetic hysteresis for a superconducting plate
G. F. Zharkov
The self-consistent solutions of a nonlinear Ginzburg--Landau equations, which describe the behavior of a superconducting plate of thickness 2D in a magnetic field H parallel to it…
Possible d+id scenario in La_{2-x}Sr_{x}CuO_4 by point-contact measurements
D. Daghero, R. S. Gonnelli, G. A. Ummarino +1
We analyze the results of point-contact measurements in La_{2-x}Sr_{x}CuO_{4} (LSCO) previously reported as a clear evidence of the separation between gap and pseudogap in this cop…
"Pair" Fermi contour and repulsion-induced superconductivity in cuprates
V. I. Belyavsky, Yu. V. Kopaev
The pairing of charge carriers with large pair momentum is considered in connection with high-temperature superconductivity of cuprate compounds. The possibility of pairing arises…