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Related Experiment Videos

27Al NMR study in UNiAl.

B Nowak1, R Troć

  • 1W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław. bnowak@int.pan.wroc.pl

Solid State Nuclear Magnetic Resonance
|March 29, 2001
PubMed
Summary
This summary is machine-generated.

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Researchers studied the magnetic properties of UNiAl using 27Al NMR. They found the transferred hyperfine field at Aluminum nuclei is isotropic, providing insights into magnetic interactions in this antiferromagnetic compound.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • The ternary compound UNiAl exhibits antiferromagnetic ordering below 19.3 K.
  • Understanding magnetic interactions in such materials is crucial for materials science applications.

Purpose of the Study:

  • To investigate the magnetic properties of UNiAl in its paramagnetic state.
  • To determine the nature of the transferred hyperfine field at 27Al nuclei.

Main Methods:

  • Utilized 27Al Nuclear Magnetic Resonance (NMR) technique.
  • Employed magnetically oriented samples for anisotropic measurements.
  • Measured Knight shift and magnetic susceptibility as a function of temperature.

Main Results:

Related Experiment Videos

  • The quadrupole coupling constant (e2qQ/h) was found to be temperature-independent at 1.56 MHz.
  • The longitudinal Knight shift (Kparallel) is positive and temperature-dependent, increasing as temperature decreases.
  • The transverse Knight shift (Kperpendicular) is positive, smaller in magnitude, and weakly temperature-dependent.
  • Plots of Knight shift versus magnetic susceptibility showed a linear relationship for both components, indicating an isotropic transferred hyperfine field.

Conclusions:

  • The transferred hyperfine field at 27Al nuclei in UNiAl is isotropic, with a value of 9.2 kOe/µB.
  • This isotropic nature simplifies the understanding of magnetic interactions within the UNiAl system.
  • NMR results provide valuable data for theoretical models describing magnetic behavior in intermetallic compounds.