| Autor: |
D. G. Kuberkar, Ravi Kumar, J. H. Markna, Lalit M. Kukreja, D. S. Rana, Pankaj Misra, S. K. Malik, R. N. Parmar |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 256:693-697 |
| ISSN: |
0168-583X |
| DOI: |
10.1016/j.nimb.2007.01.165 |
| Popis: |
We report the observation of room temperature insulator to metal transition and magnetoresistance characteristics of Swift Heavy Ions (SHIs) irradiated La 0.5 Pr 0.2 Sr 0.3 MnO 3 (LPSMO) epitaxial thin films grown on single crystal (1 0 0) SrTiO 3 substrates using Pulsed Laser Deposition. The epitaxial nature and crystallanity of the films was confirmed from the structural and magnetoresistance characteristics. Irradiation with the 200 MeV Ag 15+ ions at a fluence of about 5 × 10 11 ions/cm 2 showed suppression in the resistivity by ∼68% and 31% for the films with 50 nm and 100 nm thickness respectively. The possible reasons for this suppression could be either release of strain in the films in the dead layer at the interface of film-substrate or Swift Heavy Ions induced annealing which in turn affects the Mn–O–Mn bond angle thereby favoring the Zener double exchange. Field Coefficient of Resistance (FCR) values for both films, determined from R-H data and magnetoresistance data, showed a marginal enhancement after irradiation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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