Lattice collapse in mixed-valence samarium fulleride Sm2.75C60at high pressure

J. Arvanitidis, Konstantinos Papagelis, Serena Margadonna, Kosmas Prassides

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Sm2.75C60displays large negative thermal expansion behaviour in the temperature range 4.2–32 K at ambient pressure as a result of a quasi-continuous valence change from the larger Sm2+towards the smaller Sm2.3+ion. Here we use the powder synchrotron X-ray diffraction technique at ambient temperature and elevated pressures to study the compression behaviour in the pressure range 0–6 GPa. An abrupt hysteretic phase transition, accompanied by a dramatic volume decrease (≈6.0%) and a change in colour from black to golden was found at ≈4 GPa induced by a sudden Sm valence transition from +2.3 towards +3. Such behaviour is typical of highly correlated Kondo insulators like SmS and makes Sm2.75C60the first known molecular-based member of this fascinating class of materials.

Original languageEnglish
Pages (from-to)3144-3146
Number of pages3
JournalJournal of the Chemical Society. Dalton Transactions
Volume4
Issue number19
DOIs
Publication statusPublished - 2004 Sep 28

Keywords

  • Dalton discussion no. 7
  • Fullerenes
  • Lanthanides
  • Synchrotron radiation
  • X-ray diffraction, X-ray powder diffraction

ASJC Scopus subject areas

  • Chemistry(all)

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