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Research in China on High Tc Superconductors

Published online by Cambridge University Press:  29 November 2013

Xiong Jiajiong ,
Gu Binglin  and
He Yusheng
Xiong Jiajiong
Affiliation:
Physics Department at Tsinghua University, Beijing, China
Gu Binglin
Affiliation:
Physics Department at Tsinghua University, Beijing, China
He Yusheng
Affiliation:
Physics Department at Tsinghua University, Beijing, China
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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 Tcon 48.6 K and Ba0.5La4.5Cu5Ox with Tcon = 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 Tcon in the world at that time. Moreover, a sign of superconductivity with Tc0 (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.

Type
Technical Features
Information
MRS Bulletin , Volume 14 , Issue 4: Ion Beam Deposition of Biomaterials , April 1989 , pp. 34 - 42
Copyright
Copyright © Materials Research Society 1989

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