Quadratic transverse anisotropy term due to dislocations in Mn12-Ac directly obtained by EPR spectroscopy

Abstract

High-Sensitivity Electron Paramagnetic Resonance experiments have been carried out in fresh and stressed Mn12-Acetate single crystals for frequencies ranging from 40 GHz up to 110 GHz. The high number of crystal dislocations formed in the stressing process introduces a E(S_x^2-S_y^2) transverse anisotropy term in the spin hamiltonian. From the behaviour of the resonant absorptions on the applied transverse magnetic field we have obtained an average value for E = 22 mK, corresponding to a concentration of dislocations per unit cell of c = 10^-3.

13 pages and 4 figures

References in corpus (7)

• Effects of D-strain, g-strain, and dipolar interactions on EPR linewidths of the molecular magnets Fe8 and Mn12
• 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
• Crystal defects and spin tunneling in single crystals of Mn12 clusters
• Experimental evidence of the dependence of spin tunnelling on the concentration of dislocations in Mn12 crystals

Cited by in corpus (6)

• The origin of second-order transverse magnetic anisotropy in Mn12-acetate
• Definitive spectroscopic determination of the transverse interactions responsible for the magnetic quantum tunneling in Mn12-acetate
• Exchange Interactions and High-Energy Spin States in Mn_12-acetate
• Tunneling Splittings in Mn12-Acetate Single Crystals
• Crystal defects and spin tunneling in single crystals of Mn12 clusters
• How systems of single-molecule magnets magnetize at low temperatures