Journal ArticleDOI
Microwave surface resistance of YBCO superconducting thin films under high DC magnetic field
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In this paper, the authors investigated the dc magnetic field and temperature dependences of the microwave surface resistance (R s ) of YBa 2 Cu 3 O y (YBCO) superconducting thin films with various thicknesses.Abstract:
We investigated the dc magnetic field and temperature dependences of the microwave surface resistance ( R s ) of YBa 2 Cu 3 O y (YBCO) superconducting thin films with various thicknesses. We used YBCO thin films with 300, 500, and 700 nm deposited on a MgO (1 0 0) substrate by the thermal co-evaporation method. The R s was measured using the dielectric resonator method at 21.8 GHz, and a high dc magnetic field of up to 12 T was applied parallel to the c -axis of the YBCO thin films during R s measurements. The R s value of YBCO thin films increased when dc magnetic field was applied. These relationships could be explained by using the two-fluid model for high frequency and low magnetic field limits. We defined the viscous drag coefficient η under the low magnetic limit and the high magnetic field limit as the η low ( B , T , d ) and η high ( B , T , d ), respectively. The η low values were approximately two orders of magnitude greater than η high values. Also, all η low and η high value decreased or saturated as the temperature and film thickness increased. These results show that η under the low and high magnetic field limit depended on the temperature and film thickness.read more
Citations
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Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider
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TL;DR: In this paper, the authors present a deposition process for high-temperature superconductors (HTS), the only known materials possibly having a surface impedance lower than copper under the required operating conditions, for the next-generation high-energy hadron-hadron collider.
Journal ArticleDOI
Introducing Artificial Pinning Centers Into YBCO Thin Films to Improve Surface Resistance in a DC Magnetic Field
S. Sato,T. Honma,S. Takahashi,K. Sato,M. Watanabe,K. Ichikawa,K. Takeda,K. Nakagawa,Atsushi Saito,Shigetoshi Ohshima +9 more
TL;DR: In this article, the effect of artificial pinning centers (APCs) into YBa2Cu3O7-δ (YBCO) thin films to reduce the microwave surface resistance (Rs) in a high dc magnetic field for high-performance microwave devices with high-quality factor (Q) was investigated.
Journal ArticleDOI
Microwave complex conductivity of the YBCO thin films as a function of static external magnetic field
Jerzy Krupka,Jarosław Judek,Cezariusz Jastrzebski,Tymoteusz Ciuk,Jarek Wosik,Mariusz Zdrojek +5 more
TL;DR: In this paper, a sapphire rod resonator operating at microwave frequencies was used to determine the electric properties of 600nm thick YBCO films in the superconducting state, and rigorous electromagnetic modelling was applied to transform the measured Q-factor and the resonant frequency to the complex conductivity of high accuracy.
Journal ArticleDOI
Evaluation of superconducting pickup coils with high Q for 700 MHz NMR
Satoshi Oikawa,Yuto Tanaka,Takahiro Yamada,Akira Kanamaru,Masato Takahashi,Atsushi Saito,Shigetoshi Ohshima +6 more
TL;DR: In this paper, a helmholtz-type one-turn coil using a high-temperature superconductor (HTS) for 700 MHz NMR pickup coils with a high quality factor (Q) was proposed.
References
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Passive Microwave Device Applications of High-Temperature Superconductors
TL;DR: In this paper, the surface impedance of HTS materials is investigated and some useful relations for superconductivity at microwave frequencies are discussed, as well as the relationship between HTS material surface impedance and superconducting delay lines.
Journal ArticleDOI
Design, construction, and validation of a 1-mm triple-resonance high-temperature-superconducting probe for NMR.
William W. Brey,Arthur S. Edison,Robert E. Nast,James R. Rocca,Saikat Saha,Richard S. Withers +5 more
TL;DR: A 600-MHz 1-mm triple-resonance high-temperature-superconducting (HTS) probe for nuclear magnetic resonance spectroscopy appears to have the highest mass sensitivity at any field strength.
Journal ArticleDOI
Power-handling Capability of Transmit Filters Using Superconducting Bulk Ring Resonators
TL;DR: In this paper, the power-handling capability and frequency responses of superconducting bandpass filters (BPFs) at a center frequency around 5 GHz with a 100-MHz bandwidth were investigated for application to transmit filters.
Journal ArticleDOI
Superconducting antennas for telecommunication applications based on dual mode cross slotted patches
Antonio Cassinese,Mario Barra,Ignazio L. Fragalà,Masanobu Kusunoki,Graziella Malandrino,T Nakagawa,Laura M. S. Perdicaro,K. Sato,S. Ohshima,R. Vaglio +9 more
TL;DR: In this paper, a single-patch antenna with linear (LP) and circular (CP) polarization operating in the X-band was designed and tested at prototype level using double-sided (YBa2Cu3O7−x) YBCO and Tl2Ba2Ca1Cu2O8 (Tl-2212) superconducting films.
Journal ArticleDOI
The dc magnetic field, temperature and film thickness dependence of microwave surface resistance of YBCO and DyBCO thin films
TL;DR: In this paper, the dc magnetic field and temperature dependences of the microwave surface resistance (R s ) of YBa 2 Cu 3 O y (YBCO) and DyBa 2 Co 3 OD y (DyBCO), superconducting thin films were measured using the dielectric resonator method.