Apical Cu-O bond in YBa2Cu3O7-δ superconductors by XAFS

E. A. Stern; M. Qian; Y. Yacoby; S. M. Heald; H. Maeda

doi:10.1016/0921-4534(93)90935-j

Apical Cu-O bond in YBa₂Cu₃O_7-δ superconductors by XAFS

E. A. Stern, M. Qian, Y. Yacoby, S. M. Heald, H. Maeda

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Abstract

Careful Cu K-edge X-ray absorption fine structure (XAFS) measurements on oriented powders of YBa₂Cu₃O_7-δ were made as a function of temperature, of δ, T_c, method of preparation and grain size. The XAFS data were analyzed for the Cu(1)-O(4) apical bond distance distribution. All samples indicated evidence for a double-peak in the distribution with a splitting of 0.1Å, with the clearest case for the δ ≈ 0 samples occuring for the T_c = 89K 20μm grain samples and the least clear one for the 5μm grain T_c = 93K sample. There is no significant temperature dependence of the splitting. Because the XAFS evidence for the splitting depends on a small signal, it is prudent to verify its existence by other independent measurements.

Original language	English
Pages (from-to)	331-334
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	209
Issue number	1-3
DOIs	https://doi.org/10.1016/0921-4534(93)90935-j
State	Published - 20 Apr 1993
Externally published	Yes

Bibliographical note

Funding Information:
Another experimental fact that motivates the search for local structural variations from the average structure is the recent discovery that superconducting YBCO Is thermodynamically unstable \[4\] One would expect that such instability may manifest itself by some structural deviations *Research supported by DOE grant no. DE-FG06-90ER45425 and DOE contract no DE-AC02-76CH00016 The supplying of the fine grain samples by Dr. Fatih Dogan, the help of Matthew Newville and Bruce Ravel, and informative conversations with Profs D. Shatlel, G. Deutcher, Y. Bar-Yam, A. Voronel. F Bridges, and Dr. J. Mustre de Leon are gratefully acknowledged

Funding

Another experimental fact that motivates the search for local structural variations from the average structure is the recent discovery that superconducting YBCO Is thermodynamically unstable \[4\] One would expect that such instability may manifest itself by some structural deviations *Research supported by DOE grant no. DE-FG06-90ER45425 and DOE contract no DE-AC02-76CH00016 The supplying of the fine grain samples by Dr. Fatih Dogan, the help of Matthew Newville and Bruce Ravel, and informative conversations with Profs D. Shatlel, G. Deutcher, Y. Bar-Yam, A. Voronel. F Bridges, and Dr. J. Mustre de Leon are gratefully acknowledged

Funders	Funder number
U.S. Department of Energy

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10.1016/0921-4534(93)90935-j

Cite this

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title = "Apical Cu-O bond in YBa2Cu3O7-δ superconductors by XAFS",

abstract = "Careful Cu K-edge X-ray absorption fine structure (XAFS) measurements on oriented powders of YBa2Cu3O7-δ were made as a function of temperature, of δ, Tc, method of preparation and grain size. The XAFS data were analyzed for the Cu(1)-O(4) apical bond distance distribution. All samples indicated evidence for a double-peak in the distribution with a splitting of 0.1{\AA}, with the clearest case for the δ ≈ 0 samples occuring for the Tc = 89K 20μm grain samples and the least clear one for the 5μm grain Tc = 93K sample. There is no significant temperature dependence of the splitting. Because the XAFS evidence for the splitting depends on a small signal, it is prudent to verify its existence by other independent measurements.",

author = "Stern, \{E. A.\} and M. Qian and Y. Yacoby and Heald, \{S. M.\} and H. Maeda",

note = "Funding Information: Another experimental fact that motivates the search for local structural variations from the average structure is the recent discovery that superconducting YBCO Is thermodynamically unstable \textbackslash{}[4\textbackslash{}] One would expect that such instability may manifest itself by some structural deviations *Research supported by DOE grant no. DE-FG06-90ER45425 and DOE contract no DE-AC02-76CH00016 The supplying of the fine grain samples by Dr. Fatih Dogan, the help of Matthew Newville and Bruce Ravel, and informative conversations with Profs D. Shatlel, G. Deutcher, Y. Bar-Yam, A. Voronel. F Bridges, and Dr. J. Mustre de Leon are gratefully acknowledged",

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AU - Stern, E. A.

AU - Qian, M.

AU - Yacoby, Y.

AU - Heald, S. M.

AU - Maeda, H.

N1 - Funding Information: Another experimental fact that motivates the search for local structural variations from the average structure is the recent discovery that superconducting YBCO Is thermodynamically unstable \[4\] One would expect that such instability may manifest itself by some structural deviations *Research supported by DOE grant no. DE-FG06-90ER45425 and DOE contract no DE-AC02-76CH00016 The supplying of the fine grain samples by Dr. Fatih Dogan, the help of Matthew Newville and Bruce Ravel, and informative conversations with Profs D. Shatlel, G. Deutcher, Y. Bar-Yam, A. Voronel. F Bridges, and Dr. J. Mustre de Leon are gratefully acknowledged

PY - 1993/4/20

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N2 - Careful Cu K-edge X-ray absorption fine structure (XAFS) measurements on oriented powders of YBa2Cu3O7-δ were made as a function of temperature, of δ, Tc, method of preparation and grain size. The XAFS data were analyzed for the Cu(1)-O(4) apical bond distance distribution. All samples indicated evidence for a double-peak in the distribution with a splitting of 0.1Å, with the clearest case for the δ ≈ 0 samples occuring for the Tc = 89K 20μm grain samples and the least clear one for the 5μm grain Tc = 93K sample. There is no significant temperature dependence of the splitting. Because the XAFS evidence for the splitting depends on a small signal, it is prudent to verify its existence by other independent measurements.

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