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Hyperfine interaction in cobalt by high-resolution neutron spectroscopy.

Tapan Chatterji1, Michaela Zamponi2, Joachim Wuttke2

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Ferromagnetic phase transitions are fundamental properties of magnetic materials.
  • Understanding the critical behavior near these transitions is crucial for materials science and condensed matter physics.

Purpose of the Study:

  • To investigate the ferromagnetic phase transition of elemental cobalt.
  • To determine the critical exponent and Curie temperature using a novel spectroscopic method.

Main Methods:

  • High-resolution neutron backscattering spectroscopy was employed.
  • The splitting of nuclear levels due to the hyperfine field at the cobalt nucleus was monitored.
  • Temperature dependence of the hyperfine splitting energy was measured.

Main Results:

  • The energy of the hyperfine splitting was identified as the order parameter for the ferromagnetic phase transition.
  • The critical exponent was determined to be [Formula: see text].
  • The ferromagnetic Curie temperature was found to be [Formula: see text] K.

Conclusions:

  • The determined critical exponent aligns better with the theoretical prediction for the 3D Heisenberg model compared to previous nuclear magnetic resonance studies.
  • Neutron backscattering spectroscopy provides a precise method for characterizing ferromagnetic phase transitions.