このエントリーをはてなブックマークに追加
ID 34149
FullText URL
Author
Schroder, Christian
Nojiri, Hiroyuki
Schnack, Jurgen
Hage, Peter
Luban, Marshall
Kogerler, Paul
Abstract

We identify a class of zero-dimensional classical and quantum Heisenberg spin systems exhibiting anomalous behavior in an external magnetic field B similar to that found for the geometrically frustrated kagome lattice of classical spins. Our calculations for the isotropic Heisenberg model show the emergence of a pronounced minimum in the differential susceptibility dM/dB at B-sat/3 as the temperature T is raised from 0 K for structures based on corner-sharing triangles, specifically the octahedron, cuboctahedron, and icosidodecahedron. As the first experimental evidence we note that the giant Keplerate magnetic molecule {Mo72Fe30} (Fe3+ ions on the 30 vertices of an icosidodecahedron) exhibits this behavior. For low T when Bapproximate toB(sat)/3 two competing families of spin configurations exist of which one behaves magnetically "stiff" leading to a reduction of dM/dB.

Keywords
antiferromagnet
field
lattice
spheres
state
Note
Digital Object Identifer:10.1103/PhysRevLett.94.017205
Published with permission from the copyright holder. This is the institute's copy, as published in Physical Review Letters, January 2005, Volume 94, Issue 1, Pages 4.
Publisher URL:http://dx.doi.org/10.1103/PhysRevLett.94.017205
Direct access to Thomson Web of Science record
Copyright © 2005 The American Physical Society. All rights reserved.
Published Date
2005-1
Publication Title
Physical Review Letters
Volume
volume94
Issue
issue1
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Science KeyUT
Submission Path
physics_general/16