Competing spin phases in geometrically frustrated magnetic molecules

• Schroder, Christian

• Nojiri, Hiroyuki

• Schnack, Jurgen

• Hage, Peter

• Luban, Marshall

• Kogerler, Paul

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.

収録刊行物

• Physical Review Letters

  Physical Review Letters 94 (1), 2005-01

キーワード

• antiferromagnet
• field
• lattice
• spheres
• state

詳細情報

• CRID: 1050002212335239168
• NII論文ID: 120002314111
• Web Site: https://ousar.lib.okayama-u.ac.jp/34149
• 本文言語コード: en
• 資料種別: journal article
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