Spin frustration and magnetic ordering in theS=12molecular antiferromagnetfcc−Cs3C60

Kasahara, Y., Takeuchi, Y., Itou, T., Zadik, R.H., Takabayashi, Y., Ganin, A.Y. , Arčon, D., Rosseinsky, M.J., Prassides, K. and Iwasa, Y. (2014) Spin frustration and magnetic ordering in theS=12molecular antiferromagnetfcc−Cs3C60. Physical Review B, 90, 014413. (doi:10.1103/PhysRevB.90.014413)

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Abstract

We have investigated the low-temperature magnetic state of face-centered-cubic (fcc) Cs3C60, a Mott insulator and the first molecular analog of a geometrically frustrated Heisenberg fcc antiferromagnet with S=1/2 spins. Specific heat studies reveal the presence of both long-range antiferromagnetic ordering and a magnetically disordered state below TN=2.2 K, which is in agreement with local probe experiments. These results together with the strongly suppressed TN are unexpected for conventional atom-based fcc antiferromagnets, implying that the fulleride molecular degrees of freedom give rise to the unique magnetic ground state.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ganin, Dr Alexey
Authors: Kasahara, Y., Takeuchi, Y., Itou, T., Zadik, R.H., Takabayashi, Y., Ganin, A.Y., Arčon, D., Rosseinsky, M.J., Prassides, K., and Iwasa, Y.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X
Copyright Holders:Copyright © 2014 APS
First Published:First published in Physical Review B 90:014413
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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