A high-T<sub>c</sub>superconducting phase in the Ba-Y-Cu-O system

Xie, Songhai; Fan, Heng; Cuiying, Yang; Yu, Yude; Yuging, Zhou; Zhao, Jun; Xiaodong, Zou; Chen, Dong; Li, Fanhua

doi:10.1088/0022-3727/20/6/023

J. Phys. D: Appl. Phys.

1987

DOI: 10.1088/0022-3727/20/6/023

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A high-T_csuperconducting phase in the Ba-Y-Cu-O system

Songhai Xie¹,

Heng Fan²,

Yang Cuiying³

et al.

Abstract: The crystal structure of high-Tc superconductors in the Ba-Y-Cu-O system has been investigated by means of X-ray powder diffraction and electron microscopy. The results indicate that the superstructure based on the distorted cubic perovskite subcell is responsible for the high-Tc superconducting transition at about 90 K. The high-Tc superconducting phase is pseudo-tetragonal with triple periods (3ap) along the (001) direction. The different diamagnetic and resistance behaviour is connected with different propo… Show more

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High‐resolution electron microscopy and its applications

1987

J. Elec. Microsc. Tech.

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A review of research on high-resolution electron microscopy (HREM) carried out at the Institute of Physics, the Chinese Academy of Sciences, is presented. Apart from the direct observation of crystal and quasicrystal defects for some alloys, oxides, minerals, etc., and the structure determination for some minute crystals, an approximate image-contrast theory named pseudo-weak-phase object approximation (PWPOA), which shows the image contrast change with crystal thickness, is described. Within the framework of PWPOA, the image contrast of lithium ions in the crystal of R-Li2Ti3O7 has been observed. The usefulness of diffraction analysis techniques such as the direct method and Patterson method in HREM is discussed. Image deconvolution and resolution enhancement for weak-phase objects by use of the direct method are illustrated. In addition, preliminary results of image restoration for thick crystals are given.

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High‐resolution electron microscopy and its applications

1987

J. Elec. Microsc. Tech.

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Principles and applications of convergent beam electron diffraction: A bibliography (1938‐1990)

Sung¹,

Williams

1991

J. Elec. Microsc. Tech.

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Research in China on High T_cSuperconductors

Jia-Jiong

1989

MRS Bull.

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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.

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A high-T_csuperconducting phase in the Ba-Y-Cu-O system

Cited by 3 publications

References 1 publication

High‐resolution electron microscopy and its applications

High‐resolution electron microscopy and its applications

Principles and applications of convergent beam electron diffraction: A bibliography (1938‐1990)

Research in China on High T_cSuperconductors

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Product

Resources

About

A high-Tcsuperconducting phase in the Ba-Y-Cu-O system

Cited by 3 publications

References 1 publication

High‐resolution electron microscopy and its applications

High‐resolution electron microscopy and its applications

Principles and applications of convergent beam electron diffraction: A bibliography (1938‐1990)

Research in China on High TcSuperconductors

Contact Info

Product

Resources

About

A high-T_csuperconducting phase in the Ba-Y-Cu-O system

Research in China on High T_cSuperconductors