2000
DOI: 10.1103/physrevlett.85.4803
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Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular MagnetMn12-Acetate

Abstract: The crossover between thermally assisted and pure quantum tunneling has been studied in single crystals of high spin (S = 10) uniaxial molecular magnet Mn12 using micro-Hall-effect magnetometry. Magnetic hysteresis and relaxation experiments have been used to investigate the energy levels that determine the magnetization reversal as a function of magnetic field and temperature. These experiments demonstrate that the crossover occurs in a narrow ( approximately 0. 1 K) or broad ( approximately 1 K) temperature … Show more

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Cited by 113 publications
(114 citation statements)
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“…Measuring temperature dependence of the resonance field H z for a given k gives the information on the level n that dominates tunneling at a given temperature. 11,12 Eq. (72) remains correct if the resonances for different n take place at different values of the field H z , provided that the field is being swept through all these resonances.…”
Section: Incoherent Landau-zener Processesmentioning
confidence: 99%
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“…Measuring temperature dependence of the resonance field H z for a given k gives the information on the level n that dominates tunneling at a given temperature. 11,12 Eq. (72) remains correct if the resonances for different n take place at different values of the field H z , provided that the field is being swept through all these resonances.…”
Section: Incoherent Landau-zener Processesmentioning
confidence: 99%
“…9,11,32 Suggested explanations include collective effects due to dipolar interaction between Mn 12 molecules 43 and fluctuating random noise. 48 The first requires some special initial conditions which are not satisfied in experiment 45,46,47 while the second requires certain assumptions about the spectrum of fluctuations.…”
Section: This Is Because H = −Dsmentioning
confidence: 99%
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“…Quantum tunneling in spin systems has been the topic of many theoretical [3] and experimental studies [4][5][6][7] over the past few decades. At high enough temperature, quantum effects are not significant and transitions are due to thermal activation described by the Arrhenius law.…”
Section: Introductionmentioning
confidence: 99%