Competing spin phases in geometrically frustrated magnetic molecules

Christian Schröder, Hiroyuki Nojiri, Jürgen Schnack, Peter Hage, Marshall Luban, Paul Kögerler

Research output: Contribution to journalArticle

74 Citations (Scopus)

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 Bsat/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 B ≈ Bsat/3 two competing families of spin configurations exist of which one behaves magnetically "stiff" leading to a reduction of dM/dB.

Original languageEnglish
Article number017205
JournalPhysical review letters
Volume94
Issue number1
DOIs
Publication statusPublished - 2005 Jan 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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