Residual impurity effects on the magnetic ordering in α-Mn observed by hyperfine interaction |
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Authors: | G De Doncker J Van Cauteren M Rots |
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Institution: | (1) Instituut voor Kern- and Stralingsfysika, Katholieke, Universiteit Leuven, B-3030 Leuven, Belgium |
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Abstract: | We report on the lattice location of indium in and the magnetic ordering of manganese in its α- and β-phases, as seen by perturbed
angular correlation. Quadrupole interaction spectra show that indium prefers to replace Mn atoms of type I in α-Mn, but replaces
type II atoms in the β-Mn structure. The interaction strength equalseQV
zz
/h=3.6 (6) MHz in α-Mn and 172.3 (3) MHz with ν=0.13 (1) in β-Mn. No magnetic ordering down to 4.2 K was observed in β-Mn, while
belowT
N
=95 K in the α-Mn phase, a magnetic hyperfine interaction appears indicating two distinct magnetic probe environments. The
hyperfine field, when measured atT=4.2 K, equals for 70% of the probes 6.33 (1) T, while the remaining fraction senses a 3.10 (4) T field. The magnitudes of
the hyperfine fields are essentially unaffected by a variety of conditions in the sample preparation. The ordering temperature,
on the contrary, turns out to be rather sensitive to residual impurities especially any oxygen contamination. |
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Keywords: | |
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