Evidence for soft vibrational modes
Perturbed angular correlation (PAC) spectroscopy has been used to measure a well-defined static electric quadrupole interaction in a superconducting ceramic, In0.1Y0.9Ba2Cu3O9-δ. Perturbation functions, Fourier transforms, and the derived PAC parameters are given for data taken at temperatures ranging from 77 to 1070 K. Indirect evidence is presented for the occupation of the Y site by the 111In-111Cd PAC probe. The derived electric field gradients were found to increase linearly with temperature. This result suggests the presence of soft, anisotropic vibrations in the structure. Additional evidence is presented to indicate that O2--ion or O-vacancy transport may not occur in the Y coordination sphere.
G. L. Catchen et al., "Anomalous Temperature Dependence of the Electric Field Gradient at the Y Site in In0.1Y0.9Ba2Cu3O9- δ," Physical Review B, American Physical Society (APS), Aug 1988.
The definitive version is available at https://doi.org/10.1103/PhysRevB.38.2824
Materials Science and Engineering
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© 1988 American Physical Society (APS), All rights reserved.