Muon spin relaxation investigation of tetranuclear iron(III) Fe4 (OCH3) 6 (dpm) 6 molecular cluster

D. Procissi, P. Arosio*, F. Orsini, M. Marinone, A. Cornia, A. Lascialfari

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We present a study of the spin dynamics of Fe4 (OCH3) 6 (dpm) 6 single molecule magnet by means of SQUID magnetization and muon relaxation (μ+ SR) measurements. In longitudinal field μ+ SR experiments performed at magnetic fields H=200, 1000 Oe, the muon asymmetry P (t) could be fitted by means of three components, the first constant, the second fast relaxing through a quasiexponential decay, and the third, the slowest relaxing, showing an exponential decay. The slowest muon relaxation rate λ studied as a function of temperature T displayed two structures, a broad peak at T∼15/20 K and a shoulder at T<5 K, both decreasing in amplitude and displacing toward higher temperatures as the field is increased. To mimic qualitatively the temperature behavior λ (T) at the investigated fields, we used a function expressed as the sum of two Bloembergen-Purcell-Pound (BPP)-like laws, reproducing the mechanism of relaxation. The exponential data resulted well fitted by means of a heuristic model which takes into account two correlation times τ′ and τ, related to the ground-state multiplet barrier (Δ′ / kB =7.25 K) and to the intermultiplet separation (Δ/ kB =86.4 K) between S=5 and S=4.

Original languageEnglish (US)
Article number094421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number9
DOIs
StatePublished - Sep 29 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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