Open AccessWeakening of charge order and antiferromagnetic to ferromagnetic switch over in Pr0.5Ca0.5MnO3 nanowires
Author(s) -
S. S. Rao,
K. N. Anuradha,
S. Sarangi,
S. V. Bhat
Publication year - 2005
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.2125129
Subject(s) - antiferromagnetism , condensed matter physics , charge ordering , manganite , squid , ferromagnetism , magnetometer , nanowire , materials science , ferromagnetic resonance , transition temperature , chemistry , magnetization , superconductivity , nanotechnology , charge (physics) , magnetic field , physics , ecology , quantum mechanics , biology
We have prepared crystalline nanowires (diameter ~ 50 nm, length ~ a fewmicrons) of the charge ordering manganite Pr_0.5Ca_0.5Mn_O3 using a lowreaction temperature hydrothermal method and characterized them using X-raydiffraction, transmission electron microscopy, SQUID magnetometry and electronmagnetic resonance measurements. While the bulk sample shows a charge orderingtransition at 245 K and an antiferromagnetic transition at 175 K, SQUIDmagnetometry and electron magnetic resonance experiments reveal that in thenanowires phase, a ferromagnetic transition occurs at ~ 105 K. Further, theantiferromagnetic transition disappears and the charge ordering transition issuppressed. This result is particularly significant since the charge order inPr_0.5Ca_0.5MnO_3 is known to be very robust, magnetic fields as high as 27 Tbeing needed to melt it.Comment: 12 pages including 4 figures. submitted to Applied Physics Letter
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom