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Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe18 | | J. Ummethum
; J. Nehrkorn
; S. Mukherjee
; N. B. Ivanov
; S. Stuiber
; Th. Strässle
; P. L. W. Tregenna-Pigott
; H. Mutka
; G. Christou
; O. Waldmann
; J. Schnack
; | | Date: |
27 Jun 2012 | | Abstract: | The low-temperature elementary spin excitations in the AFM molecular wheel
Fe18 were studied experimentally by inelastic neutron scattering and
theoretically by modern numerical methods, such as dynamical density matrix
renormalization group or quantum Monte Carlo techniques, and analytical
spin-wave theory calculations. Fe18 involves eighteen spin-5/2 Fe(III) ions
with a Hilbert space dimension of 10^14, constituting a physical system that is
situated in a region between microscopic and macroscopic. The combined
experimental and theoretical approach allowed us to characterize and discuss
the magnetic properties of Fe18 in great detail. It is demonstrated that
physical concepts such as the rotational-band or L&E-band concepts developed
for smaller rings are still applicable. In particular, the higher-lying
low-temperature elementary spin excitations in Fe18 or AFM wheels in general
are of discrete antiferromagnetic spin-wave character. | | Source: | arXiv, 1206.6203 | | Services: | Forum | Review | PDF | Favorites | |
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