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5f-electron localization in PuSe and PuSb

Gouder1, Wastin, Rebizant

  • 1European Commission, Joint Research Centre, Institute for Transuranium Elements, Post Box 2340, D-76175 Karlsruhe, Germany.

Physical Review Letters
|October 6, 2000
PubMed
Summary

Photoelectron spectroscopy revealed distinct electronic structures in plutonium antimonide (PuSb) and plutonium selenide (PuSe). PuSb shows localized 5f states, while PuSe exhibits characteristics of a heavy fermion system sensitive to stoichiometry.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Actinide Chemistry

Background:

  • Plutonium compounds exhibit complex electronic behaviors due to the 5f electrons.
  • Understanding the electronic structure of actinide materials is crucial for various applications.

Purpose of the Study:

  • To investigate the electronic properties of thin layers of plutonium antimonide (PuSb) and plutonium selenide (PuSe).
  • To elucidate the nature of 5f electron localization and density of states at the Fermi level in these materials.

Main Methods:

  • Utilized X-ray photoelectron spectroscopy (XPS).
  • Employed high-resolution valence-band ultraviolet photoelectron spectroscopy (UPS).

Main Results:

  • PuSb demonstrated localized 5f states and a low density of states at the Fermi level (E(F)).

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  • PuSe, identified as a heavy fermion system, displayed three narrow valence band peaks attributed to 5f emission.
  • These PuSe features were highly sensitive to stoichiometry and absent in samples prepared at 77 K.

    • Conclusions:

    • The electronic structure of PuSb and PuSe differs significantly.
    • PuSe's properties are strongly dependent on its stoichiometry and preparation temperature, highlighting its sensitivity as a heavy fermion system.