By J. Georg Bednorz (auth.), Prof. Kaoru Yamafuji, Dr. Tadataka Morishita (eds.)

The box of high-temperature superconductivity has inspired an inter­ disciplinary method of examine. It has required major cooperation and collaboration between researchers, every one of whom has dropped at it a wealthy number of event from many different fields. lately, nice advancements were made within the caliber of analysis. the topic has matured and been embarked on the subsequent level throughout the resonance among technological know-how and expertise. the present development of fabrics processing and engineering during this box is comparable to that in the past visible within the improvement of semiconductors. those contain the looks of fabrics taking where of YBa2Cu307 due to their superior houses (higher serious temperatures and more desirable flux pin­ ning) during which infrequent earth ions with huge radii (La, Nd, Sm) alternative for Y; the advance of expertise allowing development regulate at the nanometer scale; and distinct and reproducible measurements that may be used as rigorous assessments of theoretical types, which in flip are anticipated to steer to the boost­ ment of latest units. For extra growth in high-T learn, teachers and c technologists needs to pool their wisdom and adventure. i am hoping that this quantity will advertise that aim by way of supplying the reader with the newest result of high-temperature superconductor examine and should stimulate additional dialogue and collaboration.

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REFERENCES 1. S. Jin, T. H. Tiefel, R. C. Sherwood, M. E. Davis, R. B. van Dover, G. W. Kammlott, R. A. Fastnacht and H. D. Keith: Appl. Phys. Lett. 52 (1988) 2047. 2. K. Salama, V. Selvamanickam, L. Gao, and K. Sun: Appl. Phys. Lett. 54 (1989) 2352. 3. M. Murakami, M. Morita, K. Doi and M. Miyamoto: lpn. l. Appl. Phys. 28 (1989) 1189. 4. M. Murakami: "Melt Processed High Temperature Superconductors" (ed. Murakami, World Scientific, Singapore, 1993) p. 21. 5. L. Civaie, A. D. Marwick, T. K. Worthington, M.

B28 : 4227. 11. J, Peck, jr. F (1994) Phys. Rev B : to be published. 12. J, Peck, jr. W. F (1994) J. Phys. Soc. Jpn. 63 : 2878. 13. J, Peck, jr. O, Uchida S (1994) Phys. rev. B50 : 647. 14. J, Peck,jr. F (1994) Phys. Rev. Lett. : submitted. Strong Flux Pinning In Melt-Grown RE123 (RE: Sm, Eu, Gd) Superconductors Masato MURAKAMI, Sang-1m Y~O, Takamitsu HIGUCHI, Takashi OYAMA, Naomichi SAKAI and Shoji TANAKA International Superconductivity Technology Center, Superconductivity Research Laboratory, 1-16-25 Shibaura, Minato-ku, Tokyo 105 Japan ABSlRACT REBa2Cu30y superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm, Eu) exhibit relatively low Tc due to the presence of RE-Ba solid solution.

Appl. Phys. 33 (1994) L1 000. Wehler Fachbereich Physik, Universitat Wuppertal, 42097 Wuppertal, Germany *Physics Faculty, Moscow State University, 119899 Moscow, Russia ABSTRACT We have studied the I(V)-characteristics of break junctions in Y(Yb)Ba2Cu307-y single crystals. 2K a Fraunhofer-like magnetic field dependence of the critical current Ic and Fiske resonances in low magnetic fields have been observed in the I(V)-characteristic. 018. 09 nm. KEYWORDS: energy gap, Josephson effect INTRODUCTION It is well understood that hysteretic S-I-S type high-Tc superconducting (HTS) Josephson junctions could have in general several serious advantages over those junctions fabricated from conventional superconductors [ I ].

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