caa a22 4500 386337306 CHVBK 20180307111737.0 cr unu---uuuuu 161130e198904 xx s 000 0 eng 10.1557/S0883769400055044 doi S0883769400055044 pii (NATIONALLICENCE)cambridge-10.1557/S0883769400055044 Research in China on High Tc Superconductors [Elektronische Daten] Since the discovery by Karl Alex Muller and Johannes Georg Bednorz (IBM Zurich) in January 1986 that an oxide of barium, lanthanum and copper might be superconducting at temperatures up to 35 K, the superconducting transition temperature has jumped to 125 K in only two years. A great tide of high Tc superconductor exploration has swept across the world. Like their counterparts in other countries, Chinese scientists also stood in the frontline of this revolution. When Prof. Zhao Zhongxian obtained Bednorz and Müller's paper in September 1986, he thought their ideas were reasonable. A team at the Institute of Physics, Academia Sinica was then organized to search for high Tc materials. In December 1986, Zhao and his colleagues successfully obtained superconducting samples of Sr0.25La4.75Cu5Ox with onset temperature Tc on 48.6 K and Ba0.5La4.5Cu5Ox with Tc on = 46.3 K (Figure 1). This occurred only a few days after the announcement of the confirmation of superconductivity by diamag-netic observation from Japan. These were the highest records for superconducting transition temperature Tc on in the world at that time. Moreover, a sign of superconductivity with Tc 0 (zero resistivity) around 70 K was also observed in some La-Ba-Cu-O samples. Because these samples were unstable, however, the Tc decreased after several days storage in air. Since then Zhao and his colleagues have searched for materials with higher Tc by using various compositions and substitutions, different sintering processes, and heat treatments. Copyright © Materials Research Society 1989 Jiajiong Xiong Physics Department at Tsinghua University, Beijing, China Binglin Gu Physics Department at Tsinghua University, Beijing, China Yusheng He Physics Department at Tsinghua University, Beijing, China MRS Bulletin Cambridge University Press 14/4(1989-04), 34-42 0883-7694 14:4<34 1989 14 MRS https://doi.org/10.1557/S0883769400055044 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/S0883769400055044 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jiajiong Xiong Physics Department at Tsinghua University, Beijing, China NATIONALLICENCE 700 1- Binglin Gu Physics Department at Tsinghua University, Beijing, China NATIONALLICENCE 700 1- Yusheng He Physics Department at Tsinghua University, Beijing, China NATIONALLICENCE 773 0- MRS Bulletin Cambridge University Press 14/4(1989-04), 34-42 0883-7694 14:4<34 1989 14 MRS CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge