Zhao, Y. G. ; Fan, R. ; Zhang, X. P. ; Balci, H. ; Ogale, S. B. ; Venkatesan, T. ; Mandal, T. K. ; Gopalakrishnan, J. (2004) Insulator-metal transition and magnetoresistance of oxygen deficient La0.35Ca0.65MnOy Journal of Magnetism and Magnetic Materials, 284 . pp. 35-42. ISSN 0304-8853
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03048...
Related URL: http://dx.doi.org/10.1016/j.jmmm.2004.06.017
Abstract
The oxygen content of La0.35Ca0.65MnOy was decreased by annealing the samples at high temperatures in vacuum with graphite powder nearby. Insulator-metal (I-M) transition occurred upon dramatic decrease of oxygen content. Correspondingly the samples showed a large magnetoresistance (MR) and MR=C(M/Ms)2 at 4.5 K up to relatively large M/Ms. The results were explained in terms of the variation of Mn3+/Mn4+ ratio and oxygen vacancy ordering induced percolation of the ferromagnetic regions. Spin-dependent hopping model can account for the variation of MR with M/Ms and the variation of C with the decrease of oxygen content.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | La0.35Ca0.65MnOy; Oxygen Content; Insulator-metal Transition |
| ID Code: | 12314 |
| Deposited On: | 10 Nov 2010 06:26 |
| Last Modified: | 06 Jul 2012 08:22 |
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