Magnetic and microwave studies of high-spin states of single-molecule magnet Ni4

Enrique Del Barco, Andrew D. Kent, En Che Yang, David N. Hendrickson

    Research output: Contribution to journalArticlepeer-review


    Quantum tunneling of the magnetization in a single-molecule magnet has been studied in experiments that combine microwave spectroscopy (10-50 GHz) with low temperature high sensitivity micro-Hall effect magnetometry (T = 0.4 K). This method enables the monitoring of spin-state populations in the presence of microwave radiation and a direct measure of the energy splitting between low lying high-spin states. We present results that show the level repulsion between such states as a function of magnetic field in the SMM Ni4 (S = 4), which clearly indicates the formation of high-spin superposition states. The absorption linewidths provide a lower bound on the transverse relaxation time (τ2) or decoherence time of these superposition states of ∼0.5 ns. Studies as a function of microwave power and magnetic field sweep rate suggest that the energy relaxation rate decreases with increasing longitudinal field and energy splitting between states.

    Original languageEnglish (US)
    Pages (from-to)2695-2700
    Number of pages6
    Issue number16-17
    StatePublished - Nov 17 2005


    • Electron paramagnetic resonance
    • Magnetometry
    • Nanomagnet
    • Quantum computing
    • Quantum tunneling of magnetization
    • Single-molecule magnet
    • Superparamagnet

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Inorganic Chemistry
    • Materials Chemistry


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