Quantum Phase Interference and Neel-Vector Tunneling in Antiferromagnetic Molecular Wheels

Abstract

The antiferromagnetic molecular wheel Fe18 of eighteen exchange-coupled Fe(III) ions has been studied by measurements of the magnetic torque, the magnetization, and the inelastic neutron scattering spectra. The combined data show that the low-temperature magnetism of Fe18 is very accurately described by the Neel-vector tunneling (NVT) scenario, as unfolded by semiclassical theory. In addition, the magnetic torque as a function of applied field exhibits oscillations that reflect the oscillations in the NVT tunnel splitting with field due to quantum phase interference.

5 pages, 4 figures, REVTEX4, to appear in PRL

References in corpus (6)

• Direct measurement of antiferromagnetic domain fluctuations
• Macroscopic Quantum Coherence in Molecular Magnets
• Topology and spin dynamics in magnetic molecules
• Mesoscopic quantum coherence in antiferromagnetic molecular clusters
• Quantum-magneto oscillations in a supramolecular Mn(II)-[3 x 3] grid
• Low temperature magnetization and the excitation spectrum of antiferromagnetic Heisenberg spin rings

Cited by in corpus (16)

• Magnetic Cluster Excitations
• Spin dynamics of molecular nanomagnets fully unraveled by four-dimensional inelastic neutron scattering
• Single-molecule Nanomagnets
• Calculating the energy spectra of magnetic molecules: application of real- and spin-space symmetries
• Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe18
• General Magnetic Transition Dipole Moments for Electron Paramagnetic Resonance
• Combined use of translational and spin-rotational invariance for spin systems
• Geometric-phase interference in a Mn_{12} single-molecule magnet with four-fold rotational symmetry
• Unravelling the Spin Dynamics of Molecular Nanomagnets with Four-Dimensional Inelastic Neutron Scattering
• Inelastic neutron scattering study and Hubbard model description of the antiferromagnetic tetrahedral molecule Ni4Mo12
• Breaking the ring: ${}^{53}$Cr-NMR on the Cr${}_8$Cd molecular nanomagnet
• On the size of linear superpositions in molecular nanomagnets
• Magnetic properties of transition metal dimers probed by inelastic neutron scattering
• Symmetry-Induced Universal Momentum-Transfer Dependencies for Inelastic Neutron Scattering on Anisotropic Spin Clusters
• NMR and ${\mu }^{+}$SR detection of unconventional spin dynamics in Er(trensal) and Dy(trensal) molecular magnets
• Direct Spectroscopic Observation of Berry Phase Interference in the Ni${}_4$ Single-Molecule Magnet