Abstract
We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic “clock transition”, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin–spin interactions. In addition, we show that the quantum tunnelling splitting admits a chemical tuning via the modification of the ligand shell that determines the crystal field and the magnetic anisotropy. These properties are crucial to realize model spin qubits that combine the necessary resilience against decoherence, a proper interfacing with other qubits and with the control circuitry and the ability to initialize them by cooling.
Highlights
Magnetic molecules are attractive candidates to encode spin qubits and qudits.[1,2,3,4,5,6] Each molecule consists of a core of one or several magnetic ions, surrounded by non-magnetic ligands
The level anti-crossing, or magnetic “clock transition”, associated with this gap has been directly monitored by heat capacity experiments
The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin–spin interactions
Summary
Magnetic molecules are attractive candidates to encode spin qubits and qudits.[1,2,3,4,5,6] Each molecule consists of a core of one or several magnetic ions, surrounded by non-magnetic ligands.
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