Symmetry-dependent phonon interactions in YBa2Cu4O8 superconductors: a Raman and infrared spectroscopic study

✍ Scribed by A.P. Litvinchuk; M. Käll; L. Börjesson; C. Thomsen; M. Cardona; P. Berastegui; L.-G. Johansson

• Book ID: 103947962
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 208 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91770-1

✦ Synopsis

Superconductivity induced renormalization of Raman-and infrared-active optical phonons is studied for undoped and T¢-reduced Pr-and Zn-substituted double-chain YBa2CuaOa materials. The magnitude of the phonon frequency and the linewidth variation upon cooling below T, is found to be dependent on the mode symmetry; odd-end even-parity ph,'.mons respol,d qualitatively diti-erent 1o the reducl.ion of T,:. Assuming phonon coupling