Low-energy spin dynamics in the giant keplerate molecule { Mo72 Fe30 }: A muon spin relaxation and H1 NMR investigation

J. Lago*, E. Micotti, M. Corti, A. Lascialfari, A. Bianchi, S. Carretta, P. Santini, D. Procissi, S. H. Baek, P. Kögerler, C. Baines, A. Amato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We present muon spin relaxation and H1 NMR results on the magnetically frustrated keplerate molecule { Mo72 Fe30 }, aimed at studying the local spin dynamics as a function of temperature. We find that, in common with other molecular magnets, the relaxation spectrum of this material is characterized by a single dominating electronic correlation time τ. Experiments and theory show that τ has a thermally activated behavior with an activation gap of the order of the energy difference between the lowest-lying rotational bands in this material. This shows that, in the intermediate temperature range just above 1 K, the relaxation of the electronic spin system occurs via Orbach processes involving energy levels belonging to the two lowest-lying rotational bands. Our data thus provide an experimental estimate of the first interband gap.

Original languageEnglish (US)
Article number064432
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number6
DOIs
StatePublished - Aug 29 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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