High frequency EPR on dilute solutions of the single molecule magnet Ni${}_4$

Abstract

Dilute frozen solutions of the single molecule magnet Ni${}_4$ (S=4) have been studied using high frequency D-band (130 GHz) EPR. Despite the random orientation of the molecules, well defined EPR absorption peaks are observed, due to the strong variation of the splittings between the different spin-states on magnetic field. Temperature dependent studies above 4 K and comparison with simulations enable identification of the spin transitions and determination of the Hamiltonian parameters. The latter are found to be close to those of Ni${}_4$ single crystals. No echo was detected from Ni${}_4$ in pulsed experiments, which sets an upper bound of about 50 ns on the spin coherence time.

arXiv comment4 pages, 3 figures, accepted for publication in Journal of Applied Physics (52nd MMM conference proceedings)

References in corpus (9)

• Quantum Computing in Molecular Magnets
• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Quantum Coherence in an Exchange-Coupled Dimer of Single-Molecule Magnets
• High frequency EPR spectra of a molecular nanomagnet provide a key to understand Quantum Tunneling of the Magnetization
• Detailed single crystal EPR lineshape measurements for the single molecule magnets Fe8Br and Mn12-ac
• Universal mechanism of spin relaxation in solids
• Quantum Coherence between High Spin Superposition States of Single Molecule Magnet Ni${}_4$
• Origin of the fast magnetization tunneling in the single-molecule magnet [Ni(hmp)(tBuEtOH)Cl]4
• Magnetization and EPR studies of the single molecule magnet Ni${}_4$ with integrated sensors

Cited by in corpus (4)

• Direct Observation of Quantum Coherence in Single-Molecule Magnets
• Coherent Manipulation and Decoherence of S=10 Single-Molecule Magnets
• Magnetization relaxation in the single molecule magnet Ni${}_4$ under continuous microwave irradiation
• Observation of tunneling-assisted highly forbidden single-photon transitions in a Ni${}_4$ single-molecule magnet