Bulletin of the American Physical Society
2007 APS March Meeting
Volume 52, Number 1
Monday–Friday, March 5–9, 2007; Denver, Colorado
Session C1: Poster Session I
2:00 PM,
Monday, March 5, 2007
Colorado Convention Center
Room: Exhibit Hall F, 2:00pm - 5:00pm
Abstract ID: BAPS.2007.MAR.C1.140
Abstract: C1.00140 : High Resolution Neutron Diffraction Study of $\rm La_{1-x}Sr_{x}CoO_{3}$ [$0.2
Preview Abstract
Abstract
Authors:
N. Sundaram
(Physics Dept., Univ. of California, Santa Cruz)
I. E. Anderson
(Physics Dept., Univ. of California, Santa Cruz)
D. P. Belanger
(Physics Dept., Univ. of California, Santa Cruz)
K. Kamazawa
(Physics Dept., Univ. of Virginia)
D. Louca
(Physics Dept., Univ. of Virginia)
Th. Proffen
(Lujan Neutron Scattering Center, LANL)
The crystal structure and properties of
$\rm La_{1-x}Sr-{x}CoO_3$ ($\rm LaSrCoO$) have been
extensively studied in bulk crystals. We have extended the
studies to nanoparticles of $\rm LaSrCoO$ in the size range of 10-50
nm, synthesized using a hetero-nuclear
complex precursor. Particle sizes were determined from TEM
measurements. High-resolution neutron diffraction experiments
were carried out on the NPDF diffractometer at the Los Alamos
National Laboratory to analyze the local structure
above and below $T_c$. Data were collected at $T=12, 100$ and
$300$ K. We examined the implication of the particle size on
the local and average structures using both
routine Rietveld and PDF techniques. The `$r$' range dependent
PDF analyses indicate distortions from the average
crystal structure. The Jahn-Teller distortions, observed earlier
in bulk compounds, are not observed in these nanoparticle
systems. Preliminary magnetic measurements show that, although
$T_c$ is similar to that of the bulk, the
spin-glass-like behavior persists even above the critical
composition $x=0.18$, unlike the bulk. $M$ vs $T$ plots
indicate inhomogeneity. Based on these initial
results, the local structure-property correlations will be
discussed for all the compositions studied.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.C1.140
Preview Abstract Abstract
Authors:
N. Sundaram
(Physics Dept., Univ. of California, Santa Cruz)
I. E. Anderson
(Physics Dept., Univ. of California, Santa Cruz)
D. P. Belanger
(Physics Dept., Univ. of California, Santa Cruz)
K. Kamazawa
(Physics Dept., Univ. of Virginia)
D. Louca
(Physics Dept., Univ. of Virginia)
Th. Proffen
(Lujan Neutron Scattering Center, LANL)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.C1.140
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