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Mixed valency in rare-earth fullerides.

Kosmas Prassides1, Yasuhiro Takabayashi, Takeshi Nakagawa

  • 1Department of Chemistry, University of Durham, Durham DH1 3LE, UK. k.prassides@durham.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|September 11, 2007
PubMed
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Rare-earth fullerides exhibit mixed-valence behavior, showing sensitivity to temperature and pressure. These molecular materials demonstrate tunable rare-earth valency due to the fulleride acting as an electron reservoir.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Mixed-valence phenomena are known in rare-earth intermetallics, chalcogenides, and borides.
  • These materials often exhibit Kondo insulator or heavy fermion behavior.
  • Rare-earth fullerides (RE2.75C60) present a molecular-based system for studying these phenomena.

Purpose of the Study:

  • To investigate the mixed-valence behavior in rare-earth fullerides.
  • To understand the sensitivity of rare-earth valency to external stimuli like temperature and pressure.
  • To explore the role of the fulleride sublattice in modulating rare-earth valency.

Main Methods:

  • Utilized advanced crystallographic techniques.
  • Employed spectroscopic methods for microscopic insights.

Related Experiment Videos

  • Investigated the effects of temperature and pressure variations.

    • Main Results:

    • Observed a variety of temperature- and pressure-driven valence transitions in rare-earth fullerides.
    • Demonstrated abrupt and continuous valence changes.
    • Identified the fulleride sublattice as an electron reservoir influencing rare-earth 4f/5d bands.

    Conclusions:

    • Rare-earth fullerides are the first molecular-based materials exhibiting mixed-valence phenomena analogous to traditional rare-earth compounds.
    • The valency of rare-earth ions in these fullerides is highly sensitive to external stimuli.
    • The fulleride sublattice plays a crucial role in modulating rare-earth valency through electron exchange.