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Optimization of Nd1+xBa2-xCu3O7 thin-film growth conditions using micro-Raman spectroscopy

Title
Optimization of Nd1+xBa2-xCu3O7 thin-film growth conditions using micro-Raman spectroscopy
Authors
Bae J.S.Yang I.-S.Jo W.Wee S.H.Yoo S.I.
Ewha Authors
양인상조윌렴
SCOPUS Author ID
양인상scopus; 조윌렴scopus
Issue Date
2006
Journal Title
Superconductor Science and Technology
ISSN
0953-2048JCR Link
Citation
Superconductor Science and Technology vol. 19, no. 1, pp. 102 - 107
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We explore optimal growth conditions for superconducting Nd 1+xBa2-xCu3O7 (NdBCO) thin films deposited under various oxygen pressures in the range of 100-800 mTorr. In this study we address spatial inhomogeneity, growth orientation, impurity phases, cation disorder, and oxygen deficiency of NdBCO thin films by using micro-Raman scattering. The films grown in the low oxygen pressure range of 100-200 mTorr show predominantly a-axis orientation and degraded superconducting properties with a critical temperature (Tc) of ∼80 K. The degradation of the transition temperature of the films deposited at lower oxygen pressure is attributed to the cation disorder, on the basis of analysis of the apical oxygen Raman mode. On the other hand, the samples grown in the higher oxygen pressure range of 400-800 mTorr show strong c-axis orientation and much less cation disorder. These features correlate with their high values of Tc and Jc.
DOI
10.1088/0953-2048/19/1/017
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자연과학대학 > 물리학전공 > Journal papers
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