Thin films of V2O3 with thickness of 215 nm were grown on a- and c-plane sapphire by pulsed laser deposition with (001)V2O3||(001)Al2O3 and (110)V2O3||(110)Al2O3 epitaxy. The effects of the growth direction on the electrical resistivity of the films were examined. Films on c-plane sapphire displayed a metal-to-insulator transition at T=180 K compared to T=160 K in single-crystal V2O3. The films on a-plane sapphire, however, showed an insulator-to-insulator transition at T=186 K. The variation in the phase transformation characteristics and the resistivity can be attributed to different levels of strain and commensurate changes in the film morphology.
Published in:
Applied Physics Letters
(Volume:92
,
Issue:
20
)
Date of Publication:
May 2008
- Page(s):
-
202105
-
202105-3
- ISSN :
-
0003-6951
- Digital Object Identifier :
-
10.1063/1.2921787
- Product Type:
-
Journals & Magazines
- Date of Current Version :
-
18 June 2009
- Issue Date :
-
May 2008