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Your search keyword '"Guohui Cao"' showing total 2 results
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2 results on '"Guohui Cao"'

1. Study of nuclear electric quadrupole splittings in the high-T c phase of Bi-system superconductors

Author

Guohui Cao, Ruzhang Ma, and Yang Li

Subjects
Superconductivity, Nuclear and High Energy Physics, Valence (chemistry), Flux pumping, Condensed matter physics, Chemistry, Quadrupole splitting, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Ion, Condensed Matter::Superconductivity, Electric field, Quadrupole, Mössbauer spectroscopy, Physical and Theoretical Chemistry
Abstract

57Fe Mossbauer measurement have been performed in the Fe-doped high-Tc phase of Bi-system superconductor. Isomer shifts display presence of Fe3+ ions in square and pyramidal coordinations. Regarding the high-Tc superconductors as primarily ionic crystals and using effective valence and point charge model, we have calculated the electric field gradients for Fe as a replacement for Cu in the high-Tc phase. Good agreement between theory and experiment is obtained.

Published
1992
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2. Mössbauer study of the Bi-system superconductor at low temperature

Author

Ruzhang Ma, Guohui Cao, and Yang Li

Subjects
Superconductivity, Nuclear and High Energy Physics, Materials science, Condensed matter physics, Mössbauer effect, Transition temperature, Atmospheric temperature range, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, symbols.namesake, Electrical resistivity and conductivity, Phase (matter), Mössbauer spectroscopy, symbols, Physical and Theoretical Chemistry, Debye model
Abstract

Mossbauer measurements were performed in the temperature range from 77 to 300K. Temperature-dependent57Fe Mossbauer recoil-free fraction in high-Tc superconducting phase of Bi-system display cvidence of a softening in lattice vibrations, which appears at T

Published
1992
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