Mitsuru Ueda, Hideharu Mori, et al.
Journal of Polymer Science Part A: Polymer Chemistry
The Raman spectrum of polycrystalline sintered YBa2Cu3O7 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 Tc it increases in frequency on cooling but below Tc 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. © 1993.
Mitsuru Ueda, Hideharu Mori, et al.
Journal of Polymer Science Part A: Polymer Chemistry
Andreas C. Cangellaris, Karen M. Coperich, et al.
EMC 2001
A. Nagarajan, S. Mukherjee, et al.
Journal of Applied Mechanics, Transactions ASME
Imran Nasim, Melanie Weber
SCML 2024