Zhao, Y. G. ; Cai, W. ; Zhao, J. ; Zhang, X. P. ; Cao, B. S. ; Zhu, M. H. ; Zhang, L. W. ; Ogale, S. B. ; Wu, Tom ; Venkatesan, T. ; Lu, Li ; Mandal, T. K. ; Gopalakrishnan, J. (2002) Electrical transport and magnetic properties of La0.5Ca0.5MnO3-γ with varying oxygen content Physical Review B, 65 (14). 144406_1-144406_6. ISSN 0163-1829
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Official URL: http://prb.aps.org/abstract/PRB/v65/i14/e144406
Related URL: http://dx.doi.org/10.1103/PhysRevB.65.144406
Abstract
We report the tuning of oxygen content of La0.5Ca0.5MnO3-γ and its effect on electrical transport and magnetic properties. A small reduction of oxygen content leads to a decrease in sample resistivity, which is more dramatic at low temperatures. No significant change is seen to occur in the magnetic properties for this case. Further reduction in the oxygen content increases the resistivity remarkably, as compared to the as-prepared sample. The amplitude of the ferromagnetic (FM) transition at 225 K decreases, and the antiferromagnetic (AFM) transition at 130 K disappears. For samples with γ=0.17, insulator-metal transition and paramagnetic-ferromagnetic transition occur around 167 K. The results are explained in terms of the effect of oxygen vacancies on the coexistence of the metallic FM phase and the insulating charge ordered AFM phase.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 26856 |
| Deposited On: | 08 Dec 2010 13:04 |
| Last Modified: | 04 Jul 2012 02:55 |
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