期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 470, 期 7-8, 页码 383-390出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2010.02.089
关键词
YBCO; Raman modes; Phase transition; Orthotetra chain
资金
- Korea Research Foundation [KRF-2006-005-J02102]
- National Research Foundation of Korea [2006-005-J02102] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The Raman study has been performed on YBa2Cu3O7-delta (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 [O ->-(Cu) over left right arrow -o ->] and out-of-phase stretch [<- O-Cu-o ->] 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. (C) 2010 Elsevier B.V. All rights reserved.
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