Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00156 : $^{55}$Mn NMR for Antiferromagnetic $\alpha$-Mn$_{2}$O$_{3}$
Author:
The zero-field $^{55}$Mn NMR spectrum
for antiferromagnetic $\alpha$-Mn$_{2}$O$_{3}$ was measured at
low temperatures. Manganese sesquioxide (Mn$_{2}$O$_{3}$) is
used in
combustion catalysis, a method of reducing the emissions of
organic
compounds and nitrous oxide from waste gas, as an
environmentally - friendly and inexpensive catalyzer instead of
Pt and
Pd. The magnetic moment estimated from the resonance frequency
was 2.6$\mu_{B}$ per Mn$^{3+}$ ion. The temperature dependence
of the
sublattice magnetization fits not Bloch's $T^{2}$ law well
but the exponential form applicable because there is an initial
energy gap in the dispersion relation of the spin wave. From the
fitting, an energy gap of 1.82 meV and an anisotropy
energy of 0.22 meV were obtained. The spin-spin relaxation rate
was measured as a
function of the frequency and the Suhl-Nakamura interaction is
suppressed by this energy gap.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.156
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