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Finite temperatures significantly alter gadolinium metal's electronic structure. Local spin moments persist in the paramagnetic phase, challenging simple magnetism models.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Understanding finite temperature effects on electronic structure is crucial for materials science.
  • Gadolinium metal exhibits complex magnetic properties, including ferromagnetic and paramagnetic phases.
  • Previous studies often simplified the behavior of electronic states at finite temperatures.

Purpose of the Study:

  • To investigate the impact of finite temperatures on the electronic structure of bulk and surface gadolinium.
  • To analyze the spectral density of states in both ferromagnetic and paramagnetic phases.
  • To clarify the nature of spin splitting and local spin moments in gadolinium.

Main Methods:

  • Calculation of the spectral density of states (DOS).
  • Comparison of results for the ferromagnetic ground state and the paramagnetic phase.
  • Analysis of electronic structure at both the bulk and surface of gadolinium metal.

Main Results:

  • Calculated spectral properties align well with experimental photoemission data.
  • Observed vanishing spin splitting in the conduction band during the paramagnetic phase.
  • Identified finite local spin moments in both bulk and surface gadolinium, even without significant spin splitting.

Conclusions:

  • The formation of local spin moments is attributed to density of states asymmetry, not simple Stoner behavior.
  • Vanishing spin splitting is not a reliable indicator of Stoner-like magnetism in gadolinium.
  • This study provides a more nuanced understanding of finite temperature magnetism in metals.