caa a22 4500 467884404 CHVBK 20180406152730.0 cr unu---uuuuu 170328e20061101xx s 000 0 eng 10.1007/s10948-006-0225-0 doi (NATIONALLICENCE)springer-10.1007/s10948-006-0225-0 Two-Peak Temperature Dependence of Microwave Surface Impedance of Single-Crystalline YBCO Thin Films: Role of Pairing Symmetry and Defect Structure [Elektronische Daten] [V. Pan, A. Kasatkin, V. Komashko, C. Tretiatchenko, O. Ivanyuta, G. Melkov] Temperature dependencies of microwave surface impedance were measured for c-oriented highly perfect YBCO thin films deposited by off-axis dc magnetron sputtering onto CeO2-buffered r-cut sapphire substrates. A distinct two-peak structure of R s(T) and X s(T) dependencies with peaks at 28-30, K and 50, K has been revealed. The peaks become smeared at higher frequencies or in applied dc magnetic field, while the peak positions remain almost unchanged. The two-peak Z s(T) behavior is believed to be an intrinsic electron property of extremely perfect quasi-single-crystalline YBCO films. A theoretical model is suggested to explain the observed anomalous Z s(T) behavior. The model is based on the Boltzman kinetic equation for quasiparticles in layered high-T c superconductors (HTS) cuprates. It takes into account the supposed s + d wave symmetry of electron pairing and strong energy-dependent relaxation time of quasiparticles, determined mainly by their elastic scattering on extended defects parallel to the c-axis. Springer Science+Business Media, LLC, 2007 high-temperature superconductors nationallicence YBa2Cu3O7-δ thin films nationallicence linear defects nationallicence microwave surface impedance nationallicence Pan V. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut Kasatkin A. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut Komashko V. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut Tretiatchenko C. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut Ivanyuta O. Department of Cryo- and Microelectronics, T. Shevchenko National University, Glushkova Ave. 6, 03127, Kiev, Ukraine aut Melkov G. Department of Cryo- and Microelectronics, T. Shevchenko National University, Glushkova Ave. 6, 03127, Kiev, Ukraine aut Journal of Superconductivity and Novel Magnetism Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 19/7-8(2006-11-01), 561-569 1557-1939 19:7-8<561 2006 19 10948 https://doi.org/10.1007/s10948-006-0225-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-006-0225-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pan V. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut NATIONALLICENCE 700 1- Kasatkin A. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut NATIONALLICENCE 700 1- Komashko V. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut NATIONALLICENCE 700 1- Tretiatchenko C. Department of Superconductivity, Institute for Metal Physics, Vernadsky Blvd. 36, 03142, Kiev, Ukraine aut NATIONALLICENCE 700 1- Ivanyuta O. Department of Cryo- and Microelectronics, T. Shevchenko National University, Glushkova Ave. 6, 03127, Kiev, Ukraine aut NATIONALLICENCE 700 1- Melkov G. Department of Cryo- and Microelectronics, T. Shevchenko National University, Glushkova Ave. 6, 03127, Kiev, Ukraine aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 19/7-8(2006-11-01), 561-569 1557-1939 19:7-8<561 2006 19 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer