ABSTRACT: Phase-pure La0.52Sr0.28Mn1.2O3 manganite nanopowders with average crystallite sizes of 30, 60, and 200 nm have been synthesized using coprecipitation and
multiple cold isostatic pressing at 1 GPa. The crystallite size is shown to have a significant effect on the electrical and
magnetic properties of the nanopowders: with decreasing particle size, their resistivity rises by several orders of magnitude,
their Curie temperature decreases significantly, and the peak in their magnetic susceptibility broadens. The electrical and
magnetic properties of powder compacts are compared to those of ceramic samples. The powder compacts show conventional magnetic
hysteresis behavior, whereas the ceramics produced by sintering the compacts at 1270 K have an anomalous hysteresis. A mechanism
is proposed that accounts for the anomalous hysteresis behavior.
Inorganic Materials 04/2012; 47(11):1253-1257. · 0.41 Impact Factor
ABSTRACT: Anomalous magnetic susceptibility χ has been observed in mono-and polycrystalline (ceramic) samples of lanthanum strontium
manganites. The oscillations of χ observed for single crystal samples in the vicinity of the Curie temperature (and in the
paramagnetic region) are explained by the existence of magnetic clusters. The appearance of susceptibility oscillations in
ceramic samples is attributed to the formation of magnetic clusters, which may occur both in grains (at the interface between
ferro-and antiferromagnetic phases) and at the grain boundaries.
Technical Physics Letters 04/2012; 33(1):73-76. · 0.56 Impact Factor
ABSTRACT: We have observed an anomalous magnetic hysteresis in polycrystalline (ceramic) and single crystal (film) samples of La0.6Sr0.2Mn1.2O3−δ manganites with a perovskite structure. The anomaly is explained by the coexistence and interaction of two magnetic phases
(ferromagnetic and antiferromagnetic) in these lanthanumcontaining manganites.
Technical Physics Letters 06/2003; 29(7):610-612. · 0.56 Impact Factor
Low Temperature Physics 04/2003; · 0.73 Impact Factor