Infrared reflectivity studies of ceramic YBa2Cu4O8

✍ Scribed by RG Buckley; MP Staines; EM Haines; M Ziaei; BP Clayman

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 234 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91843-0

✦ Synopsis

Temperature-dependent infrared refleetivity of ceramic samples of YBa~Cu4Os and substituted YBa2Cu+Os are presented. Substitutions include rare ear'& ions for Y, and part substitutions of Zn for Cu, Ca for Y and La for Ba. It is observed that the phonon near 300 cm "t softens as the temperature is lowered and that the softening begins well above T,. The magnitude of the softening and the softening onset temperature change with T, reflecting a dependence on the hole concentration.