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

Research output: Contribution to journalArticlepeer-review

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
Article number064432
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number6
DOIs
Publication statusPublished - Aug 29 2007

ASJC Scopus subject areas

  • Condensed Matter Physics

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