Ferromagnetic ordering in superatomic solids.
In order to realize significant benefits from the assembly of solid-state materials from molecular cluster superatomic building blocks, several criteria must be met. Reproducible syntheses must reliably produce macroscopic amounts of pure material; the cluster-assembled solids must show properties that are more than simply averages of those of the constituent subunits; and rational changes to the chemical structures of the subunits must result in predictable changes in the collective properties of the solid. In this report we show that we can meet these requirements. Using a combination of magnetometry and muon spin relaxation measurements, we demonstrate that crystallographically defined superatomic solids assembled from molecular nickel telluride clusters and fullerenes undergo a ferromagnetic phase transition at low temperatures. Moreover, we show that when we modify the constituent superatoms, the cooperative magnetic properties change in predictable ways.
Department of Chemistry, Columbia University , New York, New York 10027, United States.
Chul-Ho
CH
Lee
Lian
L
Liu
Christopher
C
Bejger
Ari
A
Turkiewicz
Tatsuo
T
Goko
Carlos J
CJ
Arguello
Benjamin A
BA
Frandsen
Sky C
SC
Cheung
Teresa
T
Medina
Timothy J S
TJ
Munsie
Robert
R
D'Ortenzio
Graeme M
GM
Luke
Tiglet
T
Besara
Roger A
RA
Lalancette
Theo
T
Siegrist
Peter W
PW
Stephens
Andrew C
AC
Crowther
Louis E
LE
Brus
Yutaka
Y
Matsuo
Eiichi
E
Nakamura
Yasutomo J
YJ
Uemura
Philip
P
Kim
Colin
C
Nuckolls
Michael L
ML
Steigerwald
Xavier
X
Roy