title: (75)As NQR studies on FeAs2.
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.
authors: CSIRO Mineral Resources, Lucas Heights, NSW 2234, Australia. Electronic address: j.a.lehmann-horn@gmx.com.
authors: J A
authors: JA
authors: Lehmann-Horn
authors: CSIRO Mineral Resources, Lucas Heights, NSW 2234, Australia.
authors: R
authors: R
authors: Yong
authors: CSIRO Mineral Resources, Lucas Heights, NSW 2234, Australia.
authors: D G
authors: DG
authors: Miljak
authors: CSIRO Manufacturing, Clayton, Victoria 3168, Australia.
authors: T J
authors: TJ
authors: Bastow
keywords: Iron–arsenic compounds; Nuclear quadrupole resonance; Spin–spin relaxation times enhancement