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4 results on '"Kuan Weiyan"'

2. Hall effect in single phase Ba2YCu3O7−δ

Author

Sun Shifang, He Zhenhui, Qian Yitai, Pan Guoqiang, Zhao Yong, Chen Zuyao, Kuan Weiyan, Xia Jansheng, and Zhang Qirui

Subjects
Superconductivity, chemistry.chemical_classification, Condensed matter physics, Chemistry, General Chemistry, Normal state, Condensed Matter Physics, Magnetic susceptibility, Electrical resistivity and conductivity, Hall effect, Materials Chemistry, Anomaly (physics), Single phase, Inorganic compound
Abstract

Results of resistivity, a.c. magnetic susceptibility, Hall effect and superconductivity for single phase Ba 2 YCu 3 O 7− δ are reported. The positive value of Hall constant above T c indicates that the carriers of the sample are hole-like in normal state and its concentration is about 1.1×10 21 cm -3 at room temperature. A large anomaly of R H near T c is observed which may be indicative of granular superconductivity or be related to the intrinsic quality of this class of oxides.

Published
1987

3. The Behaviour of Negative Magnetoresistance and Hysteresis in YBa 2 Cu 3 O 7-δ

Author

Pan Guoqiang, Zhang Han, Zhao Yong, Sun Shifang, Kuan Weiyan, Yu Daoqi, Chen Zuyao, Qian Yitai, and Zhang Qirui

Subjects
Superconductivity, High-temperature superconductivity, Materials science, Colossal magnetoresistance, Condensed matter physics, Magnetoresistance, General Physics and Astronomy, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, law.invention, Condensed Matter::Materials Science, Hysteresis, law, Condensed Matter::Superconductivity, Condensed Matter::Strongly Correlated Electrons, Grain boundary, Crystallite, Electric current
Abstract

By measuring the structure, superconductivity, magnetoresistance of polycrystalline single-phase YBa2Cu3O7-δ samples, the phenomena of negative magnetoresistance and the hysteresis of the magnetoresistance have been studied. An analysis of the origin of the influence of grain boundaries on the superconductivity and the electronic transport properties are given.

Published
1988

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