No dates for Dy3+: With a single-ion magnet containing dysprosium, magnetic-site dilution leads to a hysteresis loop that can be detected at 0.5 and 2 K. On cooling below 8 K, the relaxation mechanism of the undiluted complex changes from a thermally activated process to quantum tunneling. The quantum tunneling can be suppressed by applying a direct-current field and by magnetic site dilution.
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