Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-27
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 4 figures
Scientific paper
10.1063/1.2125129
Nd_0.5 Ca_0.5 MnO_3 (NCMO) nanoparticles (average diameter ~ 20 and 40 nm) are synthesized by polymeric precursor sol-gel method and characterized by X- ray diffraction, transmission electron microscopy (TEM), selective area electron diffraction (SAED), superconducting quantum interference device (SQUID) magnetometery and resistivity measurements. Both single crystalline and polycrystalline particles are present in the samples and they are found to retain the orthorhombic structure of the bulk NCMO. However, most strikingly, in the 20 nm particles, the charge ordered (CO) and the antiferromagnetic phases observed in the bulk at 250 K and 160 K respectively are completely absent. Instead, a ferromagnetic (FM) transition is observed at 95 K followed by an insulator to metal transition at 75 K. In the 40 nm particles, though a weak, residual CO phase is observed, transition to FM state also occurs, but at a slightly higher temperature of 110 K. The magnetization is found to increase with the decrease of particle size.
Bhat S. V.
Rao Sumathi
No associations
LandOfFree
Suppression of charge order and antiferromagnetic to ferromagnetic switchover in Nd_0.5 Ca_0.5 MnO_3 nanoparticles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Suppression of charge order and antiferromagnetic to ferromagnetic switchover in Nd_0.5 Ca_0.5 MnO_3 nanoparticles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Suppression of charge order and antiferromagnetic to ferromagnetic switchover in Nd_0.5 Ca_0.5 MnO_3 nanoparticles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-290810