Probing spin frustration in high-symmetry magnetic nanomolecules by inelastic neutron scattering

V O Garlea, S E Nagler, J L Zarestky, C Stassis, D Vaknin, P Kogerler, D F McMorrow, C Niedermayer, D A Tennant, B Lake, Y Qiu, M Exler, J Schnack, M Luban

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53 Citations (Scopus)

Abstract

Low temperature inelastic neutron scattering studies have been performed to characterize the low energy magnetic excitation spectrum of the magnetic nanomolecule {Mo72Fe30}. This unique highly symmetric cluster features spin frustration and is one of the largest discrete magnetic molecules studied to date by inelastic neutron scattering. The 30 s=5/2 Fe-III ions, embedded in a spherical polyoxomolybdate molecule, occupy the vertices of an icosidodecahedron and are coupled via nearest-neighbor antiferromagnetic interactions. The overall energy scale of the excitation and the gross features of the temperature dependence of the observed neutron scattering are explained by a quantum model of the frustrated spin cluster. However, no satisfactory theoretical explanation is yet available for the observed magnetic field dependence.

Original languageEnglish
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Volume73
DOIs
Publication statusPublished - Jan 2006

Keywords

  • MOLECULES
  • CLUSTERS
  • MO72FE30

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