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ID 34149
フルテキストURL
著者
Schroder, Christian University of Applied Sciences Bielefeld
Nojiri, Hiroyuki Okayama University
Schnack, Jurgen Universitat Osnabruck
Hage, Peter Universitat Osnabruck
Luban, Marshall Iowa State University
Kogerler, Paul Iowa State University
抄録

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.

キーワード
antiferromagnet
field
lattice
spheres
state
備考
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.
発行日
2005-1
出版物タイトル
Physical Review Letters
94巻
1号
資料タイプ
学術雑誌論文
言語
English
査読
有り
DOI
Web of Sience KeyUT
Submission Path
physics_general/16