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By John Clarke, Du Quan, M. J. Ferrari, J. J. Kingston, A. H. Miklich, F. C. Wellstood (auth.), Dr. Koji Kajimura, Prof. Dr. Hisao Hayakawa (eds.)

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Additional info for Advances in Superconductivity III: Proceedings of the 3rd International Symposium on Superconductivity (ISS ’90), November 6–9, 1990, Sendai

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OYAMA, H. FUJIMOTO, S. GOTOR, N. KOSHlZUKA, and S. TANAKA M. MURAKAMI, Y. SHIORARA, K. YAMAGUCHI, T. TAKATA, Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13, Shinonome I-chome, Koto-ku, Tokyo, 135 Japan ABSTRACT The YBaCuO prepared by the Melt-Powder-Melt-Growth (MPMG) process contains fine Y2BaCu05 (211) inclusions embedded in the YBa2Cu30x matrix. Flux pinning force can be increased with increasing the volume fraction of the 211 inclusions. 250X which contains 25 volume % 211 inclusions exhibits a Je value exceeding 3x104 A/cm 2 at 17K and IT, YBa2Cu30x which contains no 211 exhibit a Jc value of 3x10 3A/cm 2 at the same condition.

0 100 103 0 5 Magnetic Field (kOe) .... 8 fti g (5 .... ~ u 17K ... -- -.... 1000 Time (s) • ' ...... 1T 10000 10 Fig. 1. Magnetic field dependence of Jc for three different MPMG grown YBaCuO crystals with different 211 contents. Fig. 2. Time decay of magnetization hysteresis for two different MPMG grown YBaCuO crystals with and without 211. 13 8 --... Cu 3 O? Hlle 4 2 0 70 80 T (K) 90 Fig. 3. The irreversibility lines for YBaCuO single crystal and MPMG grown YBaCuO with 211. Microstructure of MPMG grown YBaCuQ crystalsW Figure 4 shows transmission electron micrographs for MPMG grown YBaCuO crystals with and without the 211 particles.

The large transformer had a gain of 7 . 5 and operated at temperatures up to 79K. 7 and ceased to operate at 25K. 4 mQ) which probably arose from a localized defect. The meas)Jred field sensitivities are shown in Fig. 6 . In each case, external noise was observed, indicating that shielding of exter~al magnetic field fluctuations was inadequate. 35pT Hz-l/2 at 1kHz. In both cases, the sensitivity was limited by noise in the SQUID; a quieter high-Tc SQUID should produce an improvement in the magnetic field sensitivity.

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