Issue 19, 2004

Lattice collapse in mixed-valence samarium fulleride Sm2.75C60 at high pressure

Abstract

Sm2.75C60 displays 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 Sm2.75C60 the first known molecular-based member of this fascinating class of materials.

Graphical abstract: Lattice collapse in mixed-valence samarium fulleride Sm2.75C60 at high pressure

Article information

Article type
Paper
Submitted
13 Apr 2004
Accepted
28 May 2004
First published
23 Jul 2004

Dalton Trans., 2004, 3144-3146

Lattice collapse in mixed-valence samarium fulleride Sm2.75C60 at high pressure

J. Arvanitidis, K. Papagelis, S. Margadonna and K. Prassides, Dalton Trans., 2004, 3144 DOI: 10.1039/B405511J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements