Structure of the high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>above (124 K) and below (71 K)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>by neutron diffraction
Qiurong YanInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaP. L. ZhangInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaZ. G. ShenInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaJiangao ZhaoInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaY. RenInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaY. N. WeiInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaT. D. MaoInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaC. X. LiuInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaT. S. NingInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaKe SunInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of ChinaQ. S. YangInstitute of Physics, Academia Sinica, Box 603, Beijing, People's Republic of China
1987lv
ABI
Аннотация
The crystal structure of the high-${T}_{c}$ superconductor ${\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7+x}$ at 124 and 71 K was refined by Rietveld analysis of neutron-diffraction data. We found that at 124 and 71 K the structure is of the same space group Pmmm, but when the temperature is decreased and passes the critical temperature ${T}_{c}$, 0.12 of the oxygen population on the $1e$ site transfers to the $1b$ site. This remarkable change in the structure can be related to its superconductivity.
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