Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18

Ummethum J, Nehrkorn J, Mukherjee S, Ivanov N, Stuiber S, Straessle T, Tregenna-Piggott PLW, Mutka H, Christou G, Waldmann O, Schnack J (2012)
Physical Review B 86(10).

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Abstract
The low-temperature elementary spin excitations in the AFM molecular wheel Fe-18 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. Fe-18 involves eighteen spin-5/2 Fe-III ions with a Hilbert space dimension of similar to 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 Fe-18 in great detail. It is demonstrated that physical concepts such as the rotational-band or L and E-band concepts developed for smaller rings are still applicable. In particular, the higher-lying low-temperature elementary spin excitations in Fe-18 or AFM wheels, in general, are of discrete antiferromagnetic spin-wave character.
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Ummethum J, Nehrkorn J, Mukherjee S, et al. Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18. Physical Review B. 2012;86(10).
Ummethum, J., Nehrkorn, J., Mukherjee, S., Ivanov, N., Stuiber, S., Straessle, T., Tregenna-Piggott, P. L. W., et al. (2012). Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18. Physical Review B, 86(10).
Ummethum, J., Nehrkorn, J., Mukherjee, S., Ivanov, N., Stuiber, S., Straessle, T., Tregenna-Piggott, P. L. W., Mutka, H., Christou, G., Waldmann, O., et al. (2012). Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18. Physical Review B 86.
Ummethum, J., et al., 2012. Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18. Physical Review B, 86(10).
J. Ummethum, et al., “Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18”, Physical Review B, vol. 86, 2012.
Ummethum, J., Nehrkorn, J., Mukherjee, S., Ivanov, N., Stuiber, S., Straessle, T., Tregenna-Piggott, P.L.W., Mutka, H., Christou, G., Waldmann, O., Schnack, J.: Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18. Physical Review B. 86, (2012).
Ummethum, Jörg, Nehrkorn, J., Mukherjee, S., Ivanov, Nedko, Stuiber, S., Straessle, Th., Tregenna-Piggott, P. L. W., Mutka, H., Christou, G., Waldmann, O., and Schnack, Jürgen. “Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe-18”. Physical Review B 86.10 (2012).
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