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

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

2001-11-12

arxiv.org/abs/cond-mat/0111208v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages and 4 figures

Scientific paper

10.1103/PhysRevB.65.172403

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.

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