Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe18

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.

16 pages, 10 figures

References in corpus (8)

• The ALPS project release 1.3: open source software for strongly correlated systems
• Calculating the energy spectra of magnetic molecules: application of real- and spin-space symmetries
• Dynamic and thermodynamic properties of the generalised diamond chain model for azurite
• Quantized antiferromagnetic spin waves in the molecular Heisenberg ring CsFe${}_8$
• E-band excitations in the magnetic Keplerate molecule Fe30
• Quantum dynamics of the Neel vector in the antiferromagnetic molecular wheel CsFe8
• Local Density of States for Individual Energy Levels in Finite Quantum Wires
• Dynamics in two-leg spin ladder with a four-spin cyclic interaction

Cited by in corpus (1)

• The even-odd effect in short antiferromagnetic Heisenberg chains