Physics – Condensed Matter – Superconductivity
Scientific paper
2000-05-31
Physics
Condensed Matter
Superconductivity
5 pages, 3 ps format figures
Scientific paper
10.1103/PhysRevB.63.092508
We report the observation of two dielectric transitions at 110K and 60K in the microwave response of non-superconducting YBa_{2}Cu_{3}O_{6.0} crystals. The transitions are characterized by a change in polarizability and presence of loss peaks, associated with overdamped dielectric modes. An explanation is presented in terms of changes in polarizability of the apical O atoms in the Ba-O layer, affected by lattice softening at 110K, due to change in buckling of the Cu-O layer. The onset of another mode at 60K strongly suggests an additional local lattice change at this temperature. Thus microwave dielectric measurements are sensitive indicators of lattice softening which may be relevant to superconductivity.
Erb Andreas
Parimi Patanjali V.
Sokoloff J. B.
Sridhar Srinath
Zhai Zehui
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