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Crystal growth, structural and magnetic properties of $Nd_1\hspace{2mm}_−_xPb_xMnO_3$

Ghosh, Nilotpal and Elizabeth, Suja and Bhat, HL and Subanna, GN and Sahana, M (2003) Crystal growth, structural and magnetic properties of $Nd_1\hspace{2mm}_−_xPb_xMnO_3$. In: Journal of Magnetism and Magnetic Materials, 256 (1-3). pp. 286-292.

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Single crystals of $Nd_1\hspace{2mm}_−_xPb_xMnO_3$ with various dopant concentrations (x=0.15, 0.2, 0.3, 0.4 and 0.5) are grown by high temperature solution growth technique using $PbO-PbF_2$ flux. Charge-to-flux ratio and $PbO-PbF_2$composition are optimized to grow good quality crystals at lower temperature. When the $PbO:PbF_2$ratio is close to the eutectic composition, crystal yield has improved. Powder X-ray diffraction studies reveal that the crystals exhibit tetragonal symmetry. Super-lattice structure obtained from transmission electron microscopic investigations suggests lattice doubling. Magnetization measurements show that the Curie temperature $(T_C)$ increases with dopant concentration. A second transition observed below 30 K is probably due to ordering of the $Nd^3^+$ ions. The magnetization does not saturate up to a field of 50 kOe at 20 K suggesting a non-collinear (canting) ordering of Nd-spins.

Item Type: Journal Article
Publication: Journal of Magnetism and Magnetic Materials
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Manganites;CMR;Single crystal;Super structure;Magnetization
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Jun 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ac.in/id/eprint/7230

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