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(75)As NQR studies on FeAs2
J A Lehmann-Horn1, R Yong1, D G Miljak1
1CSIRO Mineral Resources, Lucas Heights, NSW 2234, Australia.
Abstract:
(75)As NQR spectra and relaxation times of synthetic and natural FeAs2 samples have been studied at variable static magnetic field and temperature. FeAs2 is a well understood diamagnetic semiconductor and occurs as the natural mineral lollingite in selected ore deposits. We observed a spin-spin relaxation time enhancement of up to five in synthetic powders in the presence of a weak external static magnetic field. The effect is of interest with regard to signal-to-noise ratio improvement for materials characterization applications where broad NQR absorption lines are excited with wideband pulse sequences.
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