TY - JOUR
T1 - Neutron diffraction study of a (C,Cu)(Sr,Ca)2(Y,Ca,Sr) Cu2O7 superconductor
AU - Miyazaki, Y.
AU - Yamane, H.
AU - Kajitani, T.
AU - Morii, Y.
AU - Funahashi, S.
AU - Hirai, T.
N1 - Funding Information:
The authors thank Yutaka Shimojo for his technical assistance in the neutron diffraction experiments. This work was supported in part by a Grant-in-Aid for Scientific Research on Priority Areas, "'Science of High-To Superconductivity" and a Grant-in-Aid for New Program under contract No. 05NP0501 given by the Ministry of Education, Science and Culture, Japan, and JSPS Fellowships for Japanese Junior Scientists.
PY - 1995/8/1
Y1 - 1995/8/1
N2 - The crystal structure of a cuprate containing CO3 groups, (C0.58Cu0.42)(Sr0.88Ca0.12)2(Y0.50Ca0.26Sr0.24)Cu2O7, and its high-pressure oxygen-annealed samples were refined by means of the Rietveld method for neutron-powder-diffraction data. The as-prepared sample (non-superconducting) has neither oxygen defect nor carbonate defect in the structure. Noticeable absence of oxygen atoms and carbonate groups are detected for the annealed (superconducting) sample. It is suggested that hole doping is achieved during high-pressure oxygen annealing by the release of some CO3 groups and by the introduction of oxygen atoms into the vacant 'apical' oxygen site, when the CO3 group is not present.
AB - The crystal structure of a cuprate containing CO3 groups, (C0.58Cu0.42)(Sr0.88Ca0.12)2(Y0.50Ca0.26Sr0.24)Cu2O7, and its high-pressure oxygen-annealed samples were refined by means of the Rietveld method for neutron-powder-diffraction data. The as-prepared sample (non-superconducting) has neither oxygen defect nor carbonate defect in the structure. Noticeable absence of oxygen atoms and carbonate groups are detected for the annealed (superconducting) sample. It is suggested that hole doping is achieved during high-pressure oxygen annealing by the release of some CO3 groups and by the introduction of oxygen atoms into the vacant 'apical' oxygen site, when the CO3 group is not present.
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U2 - 10.1016/0921-4526(95)00072-H
DO - 10.1016/0921-4526(95)00072-H
M3 - Article
AN - SCOPUS:0029354901
VL - 213-214
SP - 94
EP - 96
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - C
ER -