Search for incoherent tunnel fluctuations of the magnetisation in nanoparticles of artificial ferritin

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dc.creatorGilles, C.
dc.creatorBonville, P.
dc.creatorWong, K. K. W.
dc.creatorMann, S.
dc.date2000-07-06
dc.date.accessioned2026-07-07T02:38:08Z
dc.date.available2026-07-07T02:38:08Z
dc.descriptionThe magnetic behaviour of nanoparticles of antiferromagnetic ferritin, with a mean Fe loading of 410 atoms per core, has been investigated by 57Fe Mossbauer absorption spectroscopy down to very low temperature (34mK). In previous experi- ments of frequency dependent magnetic susceptibility and magnetic noise performed at 25mK in similar samples, it was claimed that a resonance at a frequency of about 10**8 Hz, due to a macroscopic coherent state, had been observed. However, our search of incoherent tunnel fluctuations around 10**8 Hz using 57Fe Mossbauer spectroscopy, whose "window" of measurement of fluctuation frequencies lies in this frequency range, was unsuccessful. This casts a doubt about the previous observa- tion of macroscopic quantum coherence in ferritin.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0007090
dc.identifierhttp://arxiv.org/abs/cond-mat/0007090
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16556
dc.subjectMaterials Science
dc.titleSearch for incoherent tunnel fluctuations of the magnetisation in nanoparticles of artificial ferritin
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