Quantum tunneling and relaxation in Mn12-acetate studied by magnetic spectroscopy -: art. no. 060405

被引：33

作者：

Dressel, M

Gorshunov, B

Rajagopal, K

Vongtragool, S

Mukhin, AA

机构：

[1] Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany

[2] Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.67.060405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin relaxation in the molecular magnet Mn(12)ac is investigated by high-frequency magnetic spectroscopy in the frequency domain. By reversing the external magnetic field the intensities of the \+/-+/-10]-->\+/-9] transitions within the ground multiplet redistribute; below Tapproximate to2 K resonant quantum tunneling is directly observed as a tunnel dip in the absorption spectra of polycrystals. We quantitatively describe our observations by taking into account inhomogeneous line broadening, the time dependence of the level population during the relaxation process, and the resonance behavior of the relaxation rate due to quantum tunneling near the avoided level crossing.

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