Low Temperature Physics: 36, 59 (2010); https://doi.org/10.1063/1.3292938 (12 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 1 (January 2010), p. 74-88    ( to contents , go back )

HTS cuprate thin films with admixture of nanoparticles and their electrodynamics, related to Abrikosov vortices

V.S. Flis, A.A. Kalenyuk, A.L. Kasatkin, V.O. Moskalyuk, A.I. Rebikov, V.L. Svechnikov, C.G. Tretiatchenko, and V.M. Pan

Institute for Metal Physics, National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
E-mail: pan@imp.kiev.ua
pos Анотація:

Received Jule 21, 2009, revised August 13, 2009


The results of complex research into the relation of electrodynamic and structural characteristics of HTS cuprate YBa2Cu3O7–δ quasi-singlecrystalline thin films with different concentrations (a few mass percents) of nano-sized BaZrO3 (BZO) inclusions are presented. The nanostructure of the films is investigated with the use of high-resolution electron microscopy (HREM). This allows us to determine the main types of defects, which result in strong pinning of Abrikosov vortices and large critical current densities. The results on theoretical modeling of defect nanostructure and its influence on critical current density are considered. Magnetic and transport properties of the deposited YBCO(BZO) thin films are measured. The temperature and magnetic field dependencies of critical current density in these films are found. In addition, the experimental data on highfrequency properties of the YBCO(BZO) thin films are presented, namely, the microwave surface impedance is measured both in linear and nonlinear regimes. The obtained experimental results are discussed theoretically, and the influence, of nanostructure formed due to the BZO admixture phase in the YBCO(BZO) thin films, on electrodynamic properties of these films is analyzed.

PACS: 74.78.–w Superconducting films and lowdimensional structures;
PACS: 74.72.–h Cuprate superconductors;
PACS: 74.25.Sv Critical currents;
PACS: 74.25.Uv Vortex phases (includes vortexlattices, vortex liquids, and vortex glasses);
PACS: 74.25.Wx Vortex pinning (includes mechanisms and flux creep).

Key words: HTS cuprates, nanostructure, Abrikosov vortex, mixed state, pinning, creep, critical current, microwave impedance.

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