Takahashi Susumu, van Tol Johan, Beedle Christopher C, Hendrickson David N, Brunel Louis-Claude, Sherwin Mark S
Department of Physics and Center for Terahertz Science and Technology, University of California, Santa Barbara, California 93106, USA.
Phys Rev Lett. 2009 Feb 27;102(8):087603. doi: 10.1103/PhysRevLett.102.087603. Epub 2009 Feb 24.
We report coherent manipulation of S=10 Fe8 single-molecule magnets. The temperature dependence of the spin decoherence time T2 measured by high-frequency pulsed electron paramagnetic resonance indicates that strong spin decoherence is dominated by Fe8 spin bath fluctuations. By polarizing the spin bath in Fe8 single-molecule magnets at magnetic field B=4.6 T and temperature T=1.3 K, spin decoherence is significantly suppressed and extends the spin decoherence time T2 to as long as 712 ns. A second decoherence source is likely due to fluctuations of the nuclear spin bath. This hints that the spin decoherence time can be further extended via isotopic substitution to smaller nuclear magnetic moments.
我们报道了对S = 10的Fe8单分子磁体的相干操控。通过高频脉冲电子顺磁共振测量的自旋退相干时间T2的温度依赖性表明，强自旋退相干主要由Fe8自旋浴涨落主导。通过在磁场B = 4.6 T和温度T = 1.3 K下极化Fe8单分子磁体中的自旋浴，自旋退相干得到显著抑制，并将自旋退相干时间T2延长至长达712 ns。第二个退相干源可能是由于核自旋浴的涨落。这暗示通过同位素取代到更小的核磁矩可以进一步延长自旋退相干时间。
