Spin tunneling via dislocations in Mn-12 acetate crystals

Abstract

We show that dislocations should be the main source of spin tunneling in Mn-12 crystals. Long-range strains caused by dislocations produce broad distribution of relaxation times that has been seen in many experiments. When the external magnetic field is applied along the c-axis of the crystal, local rotations of the magnetic anisotropy axis due to dislocations result in the effective local transverse magnetic field that unfreezes odd tunneling resonances. Scaling law is derived that provides universal description of spin tunneling for all resonances.

4 Phys. Rev. pages, 4 figures

References in corpus (1)

• Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular Magnet Mn12-Acetate

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• Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate
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• Tunneling Splittings in Mn12-Acetate Single Crystals
• Second-order transverse magnetic anisotropy induced by disorders in the single-molecule magnet Mn12
• Tunneling with dissipation and decoherence for a large spin
• Quantum dynamics of a nanomagnet in a rotating field
• Semiconductive and Photoconductive Properties of the Single Molecule Magnets Mn${}_{12}$-Acetate and Fe${}_8$Br${}_8$
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• Quadratic transverse anisotropy term due to dislocations in Mn12-Ac directly obtained by EPR spectroscopy
• Experimental Upper Bound on Superradiance Emission from Mn12 Acetate
• Observation of a Distribution of Internal Transverse Magnetic Fields in a Mn12-Based Single Molecule Magnet
• Asymmetric Lineshape due to Inhomogeneous Broadening of the Crystal-Field Transitions in Mn12ac Single Crystals
• Crystal defects and spin tunneling in single crystals of Mn12 clusters
• Pulsed field studies of the magnetization reversal in molecular nanomagnets
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• Extreme field-sensitivity of the magnetic tunneling in Fe-doped Li${}_3$N
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• Suppression of Quantum Phase Interference in Molecular Magnets Fe₈ with Dipolar-Dipolar Interaction
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• Effect of Defects on the Line shape of Electron Paramagnetic Resonance Signals from the Single-Molecule Magnet Mn12: A Theoretical Study
• More Evidence for a Distribution of Tunnel Splittings in Mn${}_{12}$-acetate
• Experimental evidence of the dependence of spin tunnelling on the concentration of dislocations in Mn12 crystals