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7 Dec 1998

Volume 73, Issue 23, pp. 3321-3467

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Spatially resolved microwave field distribution in YBaCuO disk resonators visualized by laser scanning

T. Kaiser, M. A. Hein, G. Müller, and M. Perpeet

Appl. Phys. Lett. 73, 3447 (1998); http://dx.doi.org/10.1063/1.122792 (3 pages) | Cited 12 times

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The applicability of superconducting films in high-performance microwave devices suffers from inhomogeneous growth and local defects. Therefore we have installed a laser scanning system to visualize with spatial resolution the distribution of the microwave fields in 2-in.-diam YBaCuO disk resonators. The TM310 mode was imaged at a loaded quality factor of 8.3×104 via changes of the resonant frequency at 2.21 GHz and 40 K. The field distribution agreed with a magnetic-wall model, indicating at the contour of the disk fringe fields, but without strong edge enhancement. The data also indicated an inhomogeneous effective microwave penetration depth. The spatial resolution is presently limited to about 2 mm by heat diffusion. © 1998 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
74.25.Ha Magnetic properties including vortex structures and related phenomena
85.25.Hv Superconducting logic elements and memory devices; microelectronic circuits
84.40.-x Radiowave and microwave (including millimeter wave) technology

Dependence on the microwave field of the surface resistance for YBa2Cu3O7−δ films fabricated on copper substrates

Jian-Fei Liu, Kiyomitsu Asano, Eizi Ezura, Shigemi Inagaki, Shigeru Isagawa, Hiroshi Nakanishi, Masao Fukutomi, Kazunori Komori, and Masakazu Saito

Appl. Phys. Lett. 73, 3450 (1998); http://dx.doi.org/10.1063/1.122793 (3 pages) | Cited 2 times

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The microwave field dependence of the surface resistance for YBa2Cu3O7−δ films was studied at field levels up to 400 A/m. The c-axis normal YBa2Cu3O7−δ films were deposited onto copper disks 36 mm in diameter by a laser ablation method. The surface resistance increased linearly below 50 K as the microwave magnetic field increased, which is explained better by the critical-state model than by the coupled-grain model. The critical current density decreased almost linearly with increasing temperature from 2.8×105 A/cm2 at 20 K to 4×104 A/cm2 at 77 K. © 1998 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
74.25.Sv Critical currents
81.15.Fg Pulsed laser ablation deposition
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