Crossover between thermally assisted and pure quantum tunneling in molecular magnet Mn12-acetate

@article{Bokacheva2000CrossoverBT,
  title={Crossover between thermally assisted and pure quantum tunneling in molecular magnet Mn12-acetate},
  author={Bokacheva and Kent and Walters},
  journal={Physical review letters},
  year={2000},
  volume={85 22},
  pages={
          4803-6
        }
}
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… 

Figures from this paper

Magnetic Quantum Tunneling in the Single-Molecule Magnet Mn12-Acetate
The symmetry of magnetic quantum tunneling (MQT) in the single molecule magnet Mn2-acetate has been determined by sensitive low-temperature magnetic measurements in the pure quantum tunneling regime
FIRST- AND SECOND-ORDER CROSSOVERS OF SPIN TUNNELING IN Mn12-ACETATE MOLECULAR MAGNET WITH FOURTH-ORDER ANISOTROPY
We have studied the escape rate of spin tunneling in a molecular magnet with a fourfold easy axis, such as Mn12-acetate, in the presence of an external field applied perpendicular to the easy axis.
Quantum-classical crossover of the escape rate in the biaxial nanomagnets with a higher order symmetry
Abstract The crossover of the escape rate between thermally assisted and pure quantum tunneling is studied in biaxial magnetic nanoparticles with a high symmetry. The sequential crossover occurs in
QUANTUM-CLASSICAL CROSSOVER OF THE ESCAPE RATE IN THE NANO-FERROMAGNET WITH COMPLEX CRYSTAL SYMMETRY
We investigate the quantum-classical crossover of the escape rate in the nanoscale ferromagnetic particle with complex crystal symmetries placed in an external field along the hard anisotropy axis.
Field-tuned quantum tunneling in the supramolecule dimer [Mn4]2
Field-tuned quantum tunneling of the supramolecular magnet [Mn 4 ] 2 is studied. It is a dimer constructed by two single-molecular clusters, Mn 4 (S=9/2), coupled antiferromagnetically. By means of
...
...

References

SHOWING 1-10 OF 13 REFERENCES
Quantum tunneling of magnetization - QTM '94
Preface. I: General Introduction. Macroscopic Quantum Effects in Magnetic Systems: An Overview A.J. Leggett. II: Particles (Theory). Theory of Mesoscopic Quantum Tunneling in Magnetism: A WKB
Phys
  • Rev. B 56, 8192
  • 1997
Phys
  • Rev. Lett. 83, 2398
  • 1999
Phys
  • Rev. Lett. 78, 4645
  • 1997
Science 284
  • 133
  • 1999
Sov
  • Phys. JETP 59, 420
  • 1984
Phys
  • Rev. Lett. 76, 3830 (1996); L. Thomas, F. Lionti, R. Ballou, D. Gatteschi, R. Sessoli, and B. Barbara, Nature (London) 383, 145
  • 1996
Macroscopic Tunneling of the Magnetic Moment (Cambridge
  • 1997
Acta Crystallogr
  • Sect. B 36, 2042
  • 1980
Phys
  • Rev. B 59, 11 847 (1999); G.-H. Kim, Europhys. Lett. 51, 216 (2000); H. J. W. Müller-Kirsten, D. K. Park, and J. M. S. Rana, Phys. Rev. B 60, 6662
  • 1999
...
...