Epitaxially strained Na0.7CoO2 thin films on SrTiO3 buffer layer
SCIE
SCOPUS
- Title
- Epitaxially strained Na0.7CoO2 thin films on SrTiO3 buffer layer
- Authors
- Son, JY; Shin, YH; Kim, H
- Date Issued
- 2009-02-01
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- We prepared Na0.7CoO2 thin films on (001) Al2O3 substrates that showed a negligibly strained structure and a metallic behavior similar to Na0.7CoO2. single crystal. In particular, a Na0.7CoO2 thin film on a (111) SrTiO3/(001) Al2O3 Substrate exhibited an elongated c-lattice constant as well as an anomaly in the electric transporting behavior: a transition from an insulating state to a metallic state at 105 K. This change is Caused by the structural symmetry break near the cubic-to-tetragonal transition temperature of SrTiO3. From spectroscopic ellipsometry analysis, we obtained optical conductivities for the Na0.7CoO2 thin films on the Al2O3 and SrTiO3/Al2O3 substrates. The Na0.7CoO2 thin film on the SrTiO3/Al2O3 substrate exhibited higher energy splitting between e(g) and a(1g) than the Na0.7CoO2 thin film on the Al2O3 substrate, resulting from the c-lattice elongation. (C) 2008 Elsevier B.V. All rights reserved.
- Keywords
- Crystal structure; X-ray diffration; Laser epitaxy; Oxides; SINGLE-CRYSTALS; GROWTH; NACO2O4
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26499
- DOI
- 10.1016/J.JCRYSGRO.2008.11.072
- ISSN
- 0022-0248
- Article Type
- Article
- Citation
- JOURNAL OF CRYSTAL GROWTH, vol. 311, no. 4, page. 1021 - 1024, 2009-02-01
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.