ID | 34149 |
FullText URL | |
Author |
Schroder, Christian
Nojiri, Hiroyuki
Schnack, Jurgen
Hage, Peter
Luban, Marshall
Kogerler, Paul
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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
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Publication Title |
Physical Review Letters
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Volume | volume94
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Issue | issue1
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Content Type |
Journal Article
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language |
English
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Refereed |
True
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DOI | |
Web of Science KeyUT | |
Submission Path | physics_general/16
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