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Complete 'melting' of charge order in hydrothermally grown $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ nanowires

Anuradha, KN and Rao, SS and Bhat, SV (2007) Complete 'melting' of charge order in hydrothermally grown $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ nanowires. In: Journal of Nanoscience and Nanotechnology, 7 (6). pp. 1775-1778.

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Official URL: http://www.aspbs.com/jnn/


Nanowires of $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ (PCBM) (diameter similar to 80-90 nm and length similar to 3.5 mu m) were synthesized by a low reaction temperature hydrothermal method. Single-phase nature of the sample was confirmed by XRD experiments. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the morphology and microstructures of the nanowires. While the bulk PCBM is known to exhibit charge order (CO) below 230 K along with a ferromagnetic transition at 110 K, SQUID measurements on the nanowires of PCBM show that the charge order is completely absent and a ferromagnetic transition occurs at 115 K. However, the magnetization in the nanowires is observed to be less compared to that in the bulk. This observation of the complete 'melting' of the charge order in the PCBM nanowires is particularly significant in view of the observation of only a weakening of the CO in the nanowires of $Pr_{0.5}Ca_{0.5}MnO_3$. Electron paramagnetic resonance experiments were also carried out on the PCBM nanowires using an X-band EPR spectrometer. Characteristic differences were observed in the line width of nanowires when compared with that of the bulk.

Item Type: Journal Article
Publication: Journal of Nanoscience and Nanotechnology
Publisher: American Scientific Publishers
Additional Information: Copyright of this article belongs to American Scientific Publishers.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 Aug 2007
Last Modified: 02 Feb 2012 09:27
URI: http://eprints.iisc.ac.in/id/eprint/11644

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