Raman analysis of a YBa₂Cu₃O_7−δ thin film with oxygen depletion

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• 作者：Seongsik Hong ; Hyeonsik Cheong ; Gwangseo Park
• 关键词：YBCO ; Raman modes ; Phase transition ; Orthotetra chain
• 刊名：Physica C
• 出版年：2010
• 出版时间：1 April 2010
• 年：2010
• 卷：470
• 期：7-8
• 页码：383-390
• 全文大小：894 K

文摘

The Raman study has been performed on YBa₂Cu₃O_x=7−δ (YBCO)/MgO thin films. Two modes at 232 and 596 cm⁻¹ are exhibited in a film with continuous oxygen depletion. The modes are related to in-phase stretch [] and out-of-phase stretch [←OCuo→] along the b-direction, where O(1) and o(1) are full and deficient oxygen, respectively. They are interpreted thoroughly by other publications.

Oxidized Cu films show the 630-cm⁻¹ phonon that is consistent with a mode in YBCO. This result allows us to consider the phonon as a defect mode induced from CuO molecules which are nonstoichiometric in YBCO crystals.