Quantum size effects in ultra-thin YBaCuO films.

The d-wave symmetry of the order parameter with zero energy gap in nodal directions stands in the way of using high-temperature superconductors for quantum applications. We investigate the symmetry of the order parameter in ultra-thin YBaCuO (YBCO) films by measuring the electrical transport properties of nanowires aligned at different angles relative to the main crystallographic axes. The anisotropy of the nanowire critical current in the nodal and antinodal directions reduces with the decrease in the film thickness.

Impedance-matched coplanar-waveguide metal-powder low-pass filters for cryogenic applications.

We developed impedance-matched metal-powder low-pass filters based on coplanar waveguide design and characterized them at room temperature and 77.4 K. The coplanar waveguide metal-powder (CPW-MP) filters have a return loss better than 9.

In-Plane Anisotropy of Electrical Transport in YTbBaCuO Films.

We fabricated high-quality c-axis-oriented epitaxial YBaCuO films with 15% of the yttrium atoms replaced by terbium (YTBCO) and studied their electrical properties. The Tb substitution reduced the charge carrier density, resulting in increased resistivity and decreased critical current density compared to pure YBaCuO films. The electrical properties of the YTBCO films showed an in-plane anisotropy in both the superconducting and normal states that, together with the XRD data, provided evidence for, at least, a partially twin-free film.

Energy-level quantization and single-photon control of phase slips in YBaCuO nanowires.

Significant progress has been made in superconducting quantum circuits. However new quantum devices that have longer decoherence times at higher temperatures are urgently required for quantum technologies. Superconducting nanowires with quantum phase slips are promising candidates for use in novel quantum devices.

[Evaluation of functional activity of the complement system in differential diagnosis of chronic salpingo-oophoritis].

Nonspecific and selected determinants of humoral immunity have been evaluated in 122 patients who clinically presented with "chronic salpingo-oophoritis". An objective confirmatory study is laparoscopy. The patients with clinical presentations of chronic salpingo-oophoritis displayed depressed phagocytic activity of neutrophils and function of complement in its both pathways.