Crystal defects and spin tunneling in single crystals of Mn12 clusters

Abstract

The question addressed in this paper is that of the influence of the density of dislocations on the spin tunneling in Mn12 clusters. We have determined the variation in the mosaicity of the crystal structure of fresh and thermally treated single crystals of Mn12 by analyzing the widening of low angle X-ray diffraction peaks. It has also been well established from both isothermal magnetization and relaxation experiments that there is a broad distribution of tunneling rates which is shifted to higher rates when increases the density of dislocations.

11 pages, 3 figures

References in corpus (5)

• Spin tunneling via dislocations in Mn-12 acetate crystals
• Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular Magnet Mn12-Acetate
• Dislocation-induced spin tunneling in Mn-12 acetate
• A Distribution of Tunnel Splittings in Mn${}_{12}$-Acetate
• Quadratic transverse anisotropy term due to dislocations in Mn12-Ac directly obtained by EPR spectroscopy

Cited by in corpus (4)

• Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate
• Exchange Interactions and High-Energy Spin States in Mn_12-acetate
• Quadratic transverse anisotropy term due to dislocations in Mn12-Ac directly obtained by EPR spectroscopy
• Quantum-classical transition of the escape rate of uniaxial antiferromagnetic particles in an arbitrarily directed field