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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.

Solid State Nuclear Magnetic Resonance
|August 24, 2015
PubMed
Summary
This summary is machine-generated.

Investigating iron arsenide (FeAs2) using nuclear quadrupole resonance (NQR) revealed a significant spin-spin relaxation time enhancement. This finding could improve signal-to-noise ratios in materials characterization.

Keywords:
Iron–arsenic compoundsNuclear quadrupole resonanceSpin–spin relaxation times enhancement

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Area of Science:

  • Solid-state physics
  • Materials science
  • Nuclear quadrupole resonance spectroscopy

Background:

  • Iron arsenide (FeAs2), also known as lollingite, is a diamagnetic semiconductor found in nature.
  • Nuclear Quadrupole Resonance (NQR) spectroscopy is a technique sensitive to local electronic environments.

Purpose of the Study:

  • To investigate the (75)As NQR spectra and relaxation times of synthetic and natural FeAs2.
  • To explore the influence of variable static magnetic field and temperature on these properties.
  • To assess the potential for signal-to-noise ratio improvement in materials characterization.

Main Methods:

  • Measurement of (75)As NQR spectra.
  • Determination of spin-spin relaxation times.
  • Variable static magnetic field and temperature studies on synthetic and natural FeAs2 samples.

Main Results:

  • Observed a spin-spin relaxation time enhancement of up to five in synthetic FeAs2 powders.
  • This enhancement occurred in the presence of a weak external static magnetic field.
  • The effect was studied across a range of temperatures and magnetic fields.

Conclusions:

  • A significant enhancement in spin-spin relaxation time was demonstrated for FeAs2.
  • This phenomenon holds promise for improving signal-to-noise ratios in NQR-based materials characterization.
  • Further research could optimize this effect for practical applications.