Zhao, Y. G. ; Cai, W. ; Zhao, J. ; Zhang, X. P. ; Fan, R. ; Cao, B. S. ; Zhu, M. H. ; Wu, Tom ; Ogale, S. B. ; Shinde, S. R. ; Venkatesan, T. ; Tu, Q. Y. ; Mandal, T. K. ; Gopalakrishnan, J. (2002) Insulator-metal transition and magnetoresistance of La0.5Ca0.5MnOy induced by tuning the oxygen content Journal of Applied Physics, 92 (9). pp. 5391-5394. ISSN 0021-8979
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Official URL: http://jap.aip.org/resource/1/japiau/v92/i9/p5391_...
Related URL: http://dx.doi.org/10.1063/1.1509108
Abstract
The oxygen content of La0.5Ca0.5MnOy was tuned by annealing the samples at high temperatures in flowing nitrogen with graphite powder nearby. The reduction of oxygen content has dramatic effect on the electrical transport and magnetic properties. The samples with y=2.983, 2.83, and 2.803 show an insulator-metal transition, and an unusual temperature and magnetic-field dependence of the magnetoresistance. The paramagnetic-ferromagnetic transition also shifts to lower temperatures and the antiferromagnetic transition at lower temperature is suppressed. The results are discussed in terms of the effect of oxygen vacancies on the various properties of La0.5Ca0.5MnOy.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Lanthanum Compounds; Calcium Compounds; Colossal Magnetoresistance; Metal-insulator Transition; Ferromagnetic-paramagnetic Transitions; Ferromagnetic-antiferromagnetic Transitions; Vacancies (Crystal); Stoichiometry |
| ID Code: | 84292 |
| Deposited On: | 24 Feb 2012 15:35 |
| Last Modified: | 06 Jul 2012 08:21 |
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