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Temperature dependence of the infrared properties of Hg–Ba–Cu–O high-temperature superconductor

✍ Scribed by Natália Tomašovičová; Karel Knížek; Miroslav Veverka

Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 143 KB
Volume: 378-380
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2006.01.197

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✦ Synopsis

Polycrystalline samples of HgBa 2 CuO 4þd , one underdoped with T c ¼ 84 K, one optimally doped with T c ¼ 91 K and one overdoped with T c ¼ 54 K, were prepared at 800 C in sealed silica tube under controlled partial pressures of O 2 pðO 2 Þ and Hg pðHgÞ in three-zone furnance. Critical temperature T c was adjusted by varying pðO 2 Þ or by post-annealling. The infrared spectra were investigated in the frequency range from 25 to 8000 cm À1 and temperature range from 5 to 300 K. The infrared spectra of polycrystalline HgBa 2 CuO 4þd show five peaks at 86, 150, 358, 596 and 621 cm À1 . Details of mode assignments are discussed.

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