ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Insulator–metal transition and magnetoresistance of oxygen deficient $La_{0.35}Ca_{0.65}MnO_{y}$

Zhao, YG and Fan, R and Zhang, XP and Balci, H and Ogale, SB and Venkatesan, T and Mandal, TK and Gopalakrishnan, J (2004) Insulator–metal transition and magnetoresistance of oxygen deficient $La_{0.35}Ca_{0.65}MnO_{y}$. In: Journal of Magnetism and Magnetic Materials, 284 . pp. 35-42.

[img] PDF
54.pdf - Published Version
Restricted to Registered users only

Download (527Kb) | Request a copy
Official URL: http://www.sciencedirect.com/science?_ob=MImg&_ima...


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/M-s)(2) at 4.5 K up to relatively large M/M-s. 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/M-s and the variation of C with the decrease of oxygen content.

Item Type: Journal Article
Related URLs:
Additional Information: Copyright of this article belongs to Elsevier B. V.
Keywords: La0.35Ca0.65MnOy;Oxygen content;Insulator–metal transition.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 19 Dec 2008 05:17
Last Modified: 08 Jan 2013 05:00
URI: http://eprints.iisc.ernet.in/id/eprint/17093

Actions (login required)

View Item View Item