Tuning the magnetic ground state of a novel tetranuclear Nickel(II) molecular complex by high magnetic fields

Abstract

Electron spin resonance and magnetization data in magnetic fields up to 55 T of a novel multicenter paramagnetic molecular complex [L_2Ni_4(N_3)(O_2C Ada)_4](Cl O_4) are reported. In this compound, four Ni centers each having a spin S = 1 are coupled in a single molecule via bridging ligands (including a μ_4-azide) which provide paths for magnetic exchange. Analysis of the frequency and temperature dependence of the ESR signals yields the relevant parameters of the spin Hamiltonian, in particular the single ion anisotropy gap and the g factor, which enables the calculation of the complex energy spectrum of the spin states in a magnetic field. The experimental results give compelling evidence for tuning the ground state of the molecule by magnetic field from a nonmagnetic state at small fields to a magnetic one in strong fields owing to the spin level crossing at a field of ~25 T.

revised version, accepted for publication in Physical Review B

References in corpus (6)

• Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex
• Quantum Coherence between High Spin Superposition States of Single Molecule Magnet Ni${}_4$
• Butterfly hysteresis loop at non-zero bias field in antiferromagnetic molecular rings: cooling by adiabatic magnetization
• Magnetic Anisotropy in the Molecular Complex V15
• High Magnetic Field ESR in the Haldane Spin Chains NENP and NINO
• Zeeman levels with exotic field dependence in the high field phase of a S=1 Heisenberg antiferromagnetic chain

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