Spin dynamics of heterometallic Cr7M wheels (M = Mn, Zn, Ni) probed by inelastic neutron scattering

Abstract

Inelastic neutron scattering has been applied to the study of the spin dynamics of Cr-based antiferromagnetic octanuclear rings where a finite total spin of the ground state is obtained by substituting one Cr(III) ion (s = 3/2) with Zn (s = 0), Mn (s = 5/2) or Ni (s = 1) di-cations. Energy and intensity measurements for several intra-multiplet and inter-multiplet magnetic excitations allow us to determine the spin wavefunctions of the investigated clusters. Effects due to the mixing of different spin multiplets have been considered. Such effects proved to be important to correctly reproduce the energy and intensity of magnetic excitations in the neutron spectra. On the contrary to what is observed for the parent homonuclear Cr8 ring, the symmetry of the first excited spin states is such that anticrossing conditions with the ground state can be realized in the presence of an external magnetic field. Heterometallic Cr7M wheels are therefore good candidates for macroscopic observations of quantum effects.

9 pages, 11 figures, submitted to Phys. Rev. B, corrected typos and added references, one sentence changed

References in corpus (8)

• Quantum computing with spin cluster qubits
• Quantum computing with antiferromagnetic spin clusters
• Rotational modes in molecular magnets with antiferromagnetic Heisenberg exchange
• Elementary excitations in the cyclic molecular nanomagnet Cr8
• S-mixing and quantum tunneling of the magnetization in molecular nanomagnets
• Q-dependence of the inelastic neutron scattering cross section for molecular spin clusters with high molecular symmetry
• Quantum-magneto oscillations in a supramolecular Mn(II)-[3 x 3] grid
• Macroscopic evidence of quantum coherent oscillations of the total spin in the Mn-[3x3] molecular nanomagnet

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• Unravelling the Spin Dynamics of Molecular Nanomagnets with Four-Dimensional Inelastic Neutron Scattering
• What relaxes muon spins in molecular nanomagnets?
• Theoretical estimates for proton-NMR spin-lattice relaxation rates of heterometallic spin rings
• Breaking the ring: ${}^{53}$Cr-NMR on the Cr${}_8$Cd molecular nanomagnet
• 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