The spin dynamics of a ring-shaped molecule comprising 10 iron(III) ions (s=5/2) is studied by inelastic neutron scattering. Exchange integrals and single-ion anisotropy parameters are determined by studying several intermultiplet excitations. Difficulties associated with the dimension of the Hilbert space are overcome by exploiting both the irreducible tensor operator technique and the Lanczos algorithm. By calculating the time correlation function of the Neel vector we show that the low-temperature spin dynamics of Fe-10 is only approximately described by the semiclassical picture of tunneling of the Neel vector.

Spin Dynamics and Tunneling of the Néel Vector in the Fe10 Magnetic Wheel / P. SANTINI; S. CARRETTA; G. AMORETTI; T. GUIDI; R. CACIUFFO; A. CANESCHI; D. ROVAI; Y. QIU; J. R. D. COPLEY. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 71:(2005), pp. 184405-184405. [10.1103/PhysRevB.71.184405]

Spin Dynamics and Tunneling of the Néel Vector in the Fe10 Magnetic Wheel

SANTINI, PIERO;CANESCHI, ANDREA;ROVAI, DONELLA;
2005

Abstract

The spin dynamics of a ring-shaped molecule comprising 10 iron(III) ions (s=5/2) is studied by inelastic neutron scattering. Exchange integrals and single-ion anisotropy parameters are determined by studying several intermultiplet excitations. Difficulties associated with the dimension of the Hilbert space are overcome by exploiting both the irreducible tensor operator technique and the Lanczos algorithm. By calculating the time correlation function of the Neel vector we show that the low-temperature spin dynamics of Fe-10 is only approximately described by the semiclassical picture of tunneling of the Neel vector.
2005
71
184405
184405
P. SANTINI; S. CARRETTA; G. AMORETTI; T. GUIDI; R. CACIUFFO; A. CANESCHI; D. ROVAI; Y. QIU; J. R. D. COPLEY
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/205023
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