Research in China on High T c Superconductors
- PDF / 894,803 Bytes
- 9 Pages / 604.8 x 806.4 pts Page_size
- 88 Downloads / 227 Views
leagues, 4 a Y-Ba-Cu-O sample with T?n = 93 K and Tc° = 78.5 K was obtained by Zhao and his colleagues (Figure 2).5 Five days later, when stability and reproducibility were confirmed, the news appeared in the People's Daily (February 24). For the first time in the world, they announced the composition of barium, yttrium, copper, and oxygen. This news has accelerated the research in superconductivity in many countries. Shortly after that, a research group led by Profs. Gan Zizhao and Yin Daole in Peking University achieved even an higher record — with zero resistance temperature T° = 91 K.6 Similar results were also obtained soon at University of Science and Technology of China, Nanjing University, Institute of Metals, and General Research Institute of NonFerrous Metals. A research group in Tsinghua University found superconductivity above 90 K in Ba-Y-Cu-Nb-0 quarternary system7 and a general formula for the possible superconducting perovskite ceramics was proposed as (AB03)n+(AO)n'.8 All these announcements have stimulated great enthusiasm for research in high Tc superconductors throughout China. The 1987 International Topical Meeting on High Tc Superconductivity was held June 29 to July 1 at Peking University, Beijing. Nearly 500 scientists from China, the United States, Japan, Europe, and Australia attended the workshop and more than 200 papers were contributed, covering a wide range of high Tc superconductivity research. The proceedings, published as volume 2 of the Series on Progress in High Temperature Superconductivity by World Scientific Publishing Co., has received worldwide attention. Since then, many important international and national conferences and symposia on high Tc superconductors and related
topics have been held and thousands of contributions have been published. All those events triggered intensive research in high Tc superconductivity. On September 14, 1987, the 1986 Physics Award of the Third World Academy of Science was presented by the president of the Academy, Prof. Abdus Salam (Nobel Prize winner), to Prof. Zhao Zhongxian, "for his fundamental and pioneering contributions to high temperature superconductivity, in particular for achieving the superconductivity above liquid nitrogen temperature in the Ba-Y-Cu-O system." 9 Prof. Zhao is one of the pioneers in the breakthrough research of superconductivity above liquid nitrogen temperature which is called "an important breakthrough in science and technology of the 20th century." In spite of the comparatively less modern experimental equipment and laboratory facilities available, Chinese scientists, like Prof. Zhao, have worked persistently with a tenacious spirit that has eventually led to success. This brief survey cannot include all important events of high Tc superconductivity research in China. Certain laboratories, however, and some details about materials, properties, thin films and Josephson effect, possible applications, and theories will be presented. We hope it will give a rough sketch of the progress of this field in China. Materia
Data Loading...
