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(237)Np Mössbauer effect study on NpFeAsO.

P Gaczyński1, T Klimczuk, H Walker

  • 1European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany. Institute of Physical and Theoretical Chemistry, Technische Universität Braunschweig, Hans-Sommer-Str. 10, D-38106 Braunschweig, Germany.

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Summary
This summary is machine-generated.

Neptunium-237 Mössbauer spectroscopy on NpFeAsO reveals a 5f(4) electronic configuration for neptunium (Np) ions. Magnetic ordering of the Np sublattice below 60 K shows Np magnetic moments aligned along the tetragonal c-axis.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Nuclear Physics

Background:

  • Neptunium (Np) compounds exhibit complex magnetic properties due to their localized 5f electrons.
  • Understanding the electronic and magnetic behavior of Np is crucial for nuclear energy and materials science applications.
  • NpFeAsO is an intermetallic compound with potential magnetic ordering relevant to actinide research.

Purpose of the Study:

  • To investigate the electronic configuration and magnetic ordering of neptunium in NpFeAsO.
  • To determine the magnetic moment and its orientation within the NpFeAsO crystal structure.
  • To elucidate the nature of magnetic interactions and structures in NpFeAsO using Mössbauer spectroscopy.

Main Methods:

  • Utilized (237)Np Mössbauer spectroscopy to probe the local electronic and magnetic environment of neptunium atoms.
  • Analyzed isomer shift values to determine the electronic configuration of Np ions.
  • Measured hyperfine parameters to establish magnetic ordering temperature and saturated magnetic moment.

Main Results:

  • Neptunium atoms occupy a single crystallographic site in NpFeAsO.
  • The isomer shift indicates a 5f(4) electronic configuration, corresponding to Np(3+) ions.
  • Established magnetic ordering of the Np sublattice below 60 K with a saturated magnetic moment of 1.73μB at 3.6 K.
  • Determined that neptunium magnetic moments are aligned along the tetragonal c-axis.
  • Ruled out modulated magnetic structures or spin waves on the Np site based on hyperfine parameters.

Conclusions:

  • NpFeAsO exhibits localized Np(3+) ions with a 5f(4) electronic configuration.
  • The compound undergoes magnetic ordering below 60 K, characterized by a saturated magnetic moment aligned along the c-axis.
  • The magnetic structure is simple, without evidence of complex magnetic modulations or spin waves at the Np site.