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Temperature dependence of the Raman spectrum of the high Tcsuperconductor YBa2Cu3O7

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
63
Issue
9
Identifiers
DOI: 10.1016/0038-1098(87)90895-7
Disciplines
  • Physics

Abstract

Abstract The Raman spectrum of polycrystalline sintered YBa 2Cu 3O 7 has been measured at several temperatures between 10K and 300K. Ten Raman active phonon modes are observed with frequencies of 153, 217, 291, 309, 335, 441, 493, 506, 601 and 640 cm -1. The 335 cm -1 mode shows anomalous behavior: Above T c it increases in frequency on cooling but below T c its frequency shift changes sign as the mode begins to soften. The fact that most of the mode frequencies we observe do not coincide with the measured infrared frequencies supports the assignment of the symmetry of the crystal to a centrosymmetric space group.

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