Formation and Raman spectroscopic study of YBCO/STO/YBCO heteroepitaxial structures

Abstract

Superconductor-ferroelectric-superconductor (SFS) structures were produced by magnetron sputtering of ceramic YBa2Cu307-s and BaxSrr-,Ti03 targets. Raman spectroscopy was effectively used for characterization of superconducting and ferroelectric films in layered structures. Electrical characteristics, such as the temperature dependence of resistance, currentvoltage and capacitance-voltage characteristics were measured. The possibility of applying SFS structures as cwoelectronic caDacitors with voltage control is demonstrated.

Superconducting electrode capacitor based on double-sided YBCO thin film for wireless power transfer applications

“…Our future work will aim to develop a tunable HTS capacitor for WPT applications on the basis of the above findings and previous work regarding the SFS-based capacitor. For now, there is still a major obstacle for this type of capacitor (just as in [7,8]) to work directly with the HTS coil, forming a tunable resonator, since the DC bias voltage across the ferroelectric substrate would bring a short-circuit fault to the HTS coil in connection. To achieve the tuning of the HTS capacitor based on an all-superconducting resonator for WPT technology, our focus will be on overcoming this short-circuit problem.…”

“…The impedance of the capacitor under test is measured by VNA. Then, the effective capacitance, ESR, and Q-factor can be obtained based on (3) and (7). While the comparison between the Al capacitor and HTS capacitor can reflect the effect of the HTS electrode material on the capacitor, that between the CBB bank and HTS capacitor can indicate the performance differences between these two capacitors.…”

“…In this paper, we propose an HTS capacitor based on double-sided YBCO thin film on a lanthanum aluminate (LaAlO 3 ) structure for WPT applications. In contrast to previous studies [7,8] performed on double-sided YBCO filmbased HTS capacitors, this work is the first attempt to apply this type of HTS capacitor to a WPT system. Besides capacitance, other important characteristics of a capacitor for WPT applications, including equivalent series resistance (ESR) and Q-factor, are also measured.…”

“…Some subsequent studies were performed on an HTS capacitor formed by YBa 2 Cu 3 O 7−x (YBCO) thin film deposited on ferroelectric substrate. It was found that the superconductor-ferroelectricsuperconductor (SFS) based capacitor had a capacitance dependence on the DC bias voltage [7,8]. In addition, there were other proposals for designing a capacitor with single-sided YBCO film [9][10][11].…”

Layered Structures HTSC/Ferroelectric, Prepared by Sputtering

“…The creation and investigation of capacitors with ferroelectric and electrodes of HTSC thin films are the initial steps of the development of voltage-tunable devices. In a previous work [9] we reported the results of the fabrication and study of bulk and trilayer capacitor structures. Now the characteristics of planar ca~acitors formed in YBCO / BSTO double lavers will be considered.…”