Anuradha, K. N. and Rao, S. S. and Bhat, S. Venkataprasad (2007) Complete 'melting' of charge order in hydrothermally grown Pr0.57Ca0.41Ba0.02MnO3 nanowires. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 7 (6). pp. 1775-1778. ISSN 1533-4880
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Nanowires of Pr0.57Ca0.41Ba0.02MnO3 (PCBM) (diameter approximately 80-90 nm and length approximately 3.5 microm) 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 Pr0.5Ca0.5MnO3. 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.
|Subjects:||Material Science > Functional and hybrid materials|
Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanostructured materials
Material Science > Nanochemistry
Material Science > Soft materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||27 Jan 2009 04:11|
|Last Modified:||12 Feb 2009 17:39|
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