Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00155 : The first-Order phase transition in $\beta$-MnO$_{2}$ studied by $^{55}$Mn Nuclear Magnetic Resonance
Author:
$\beta$-MnO$_{2}$ has a conductivity due to negative charge
carriers generated from slight off-stoichiometry of oxygens. We
obtained 55Mn antiferromagnetic nuclear magnetic resonance
(NMR) signal for $\beta$-MnO$_{2}$ at low temperature for the
first time. The resonance frequency of the main peak centered
at 254 MHz is nearly unchanged from 4.2 K to 130 K though it
is known that the magnetic phase changes near 94 K from the
antiferromagnetic state to the paramagnetic state. This
suggests that the magnetic phase transition is a first order
transition and the mixed phases coexist both below and above
the phase transition temperature. Side peaks were found at
161 MHz, 181 MHz and 297 MHz. Through annealing $\beta$-MnO$_
{2}$, which generates oxygen defects, we investigated whether
these peaks originate from manganese ions with their valence
other than 4+. However, the NMR spectra of the annealed $\beta$-
MnO$_{2}$ showed no difference in side peaks.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.155
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