TY - JOUR
T1 - Apical Cu-O bond in YBa2Cu3O7-δ superconductors by XAFS
AU - Stern, E. A.
AU - Qian, M.
AU - Yacoby, Y.
AU - Heald, S. M.
AU - Maeda, H.
PY - 1993/4/20
Y1 - 1993/4/20
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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=44949267975&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(93)90935-J
DO - 10.1016/0921-4534(93)90935-J
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AN - SCOPUS:44949267975
SN - 0921-4534
VL - 209
SP - 331
EP - 334
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-3
ER -