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Weakening of charge order and antiferromagnetic to ferromagnetic switch over in $Pr_{0.5}Ca_{0.5}MnO_{3}$ nanowires

Rao, SS and Anuradha, KN and Sarangi, S and Bhat, SV (2005) Weakening of charge order and antiferromagnetic to ferromagnetic switch over in $Pr_{0.5}Ca_{0.5}MnO_{3}$ nanowires. In: Applied Physics Letters, 87 (18).

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We have prepared crystalline nanowires (diameter similar to 50 nm,length similar to a few microns) of the charge-ordering manganite $Pr_{0.5}Ca_{0.5}MnO_{3}$ using a low reaction temperature hydrothermal method and characterized them using x-ray diffraction, transmission electron microscopy, superconducting quantum interference device (SQUID) magnetometry and electron magnetic resonance measurements. While the bulk sample shows a charge ordering transition at 245 K and an antiferromagnetic transition at 175 K, SQUID magnetometry and electronmagnetic resonance experiments reveal that in the nanowires phase, a ferromagnetic transition occurs at similar to 105 K. Further, the antiferromagnetic transition disappears and the charge ordering transition is suppressed. This result is particularly significant since the charge order in $Pr_{0.5}Ca_{0.5}MnO_{3}$ is known to be very robust, magnetic fields as high as 27 T being needed to melt it.

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics
Additional Information: Copyright for this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 24 Nov 2005
Last Modified: 19 Sep 2010 04:21
URI: http://eprints.iisc.ac.in/id/eprint/4134

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