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  • 1
    Electronic Resource
    Electronic Resource
    Quantum superposition of distinct macroscopic states (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 406 (2000), S. 43-46 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In 1935, Schrödinger attempted to demonstrate the limitations of quantum mechanics using a thought experiment in which a cat is put in a quantum superposition of alive and dead states. The idea remained an academic curiosity until the 1980s when it was proposed that, under ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35017505
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  • 2
    Electronic Resource
    Electronic Resource
    Steps in the hysteresis loops of a high-spin molecule : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6031-6033 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first observation of steps in the hysteresis loop of a high-spin molecular magnet. We propose that the steps, which occur every 0.46 T, are due to thermally assisted resonant tunneling between different quantum spin states. Magnetic relaxation increases dramatically when the field is in the neighborhood of a step. A simple model accounts for the observations and predicts a value for the anisotropy barrier consistent with that inferred from the superparamagnetic blocking temperature. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361837
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of a transverse magnetic field on resonant magnetization tunneling in high-spin molecules : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3978-3980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The recent observation of steps at regular intervals of magnetic field in the hysteresis loops of oriented crystals of the spin-10 molecular magnet Mn12O12(CH3COO)16(H2O)4 has been attributed to resonant tunneling between spin states. Here, we investigate the effect on the relaxation rate of applying the magnetic field at an angle with respect to the easy axis of magnetization. We find that the position of the resonances is independent of the transverse component of the field, and is determined solely by the longitudinal component. On the other hand, a transverse field significantly increases the relaxation rate, both on and off resonance. We discuss classical and quantum mechanical interpretations of this effect. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364912
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  • 4
    Electronic Resource
    Electronic Resource
    Resonant Magnetization Tunneling in the Molecular Magnet Mn12 Acetate (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 689-693 
    Details
    ISSN: 1572-9605
    Keywords: magnetization tunneling ; Mn12 acetate ; hysteresis steps ; magnetic relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract I review the evidence for thermally assisted resonant tunneling between spin states in the molecular magnet known as Mn 12 acetate. The hysteresis loops for a sample show steps at regular intervals of magnetic field, every 4.6 kOe. At these same fields, the magnetic relaxation rate increases markedly. This system can be modeled as a double-well potential with energy levels corresponding to projections of the spin along the anisotropy axis. A magnetic field tilts this potential and regularly brings levels in opposite wells into resonance, allowing tunneling between the wells. The field interval between steps quantitatively agrees with the independently measured value of the anisotropy parameter. The data imply that the tunneling is driven in part by an internal transverse magnetic field, perhaps of hyperfine origin. However, the resonances have a Lorentzian line shape with no hint of the inhomogeneous broadening expected from a random internal field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007764421933
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