Quadratic tranverse anisotropy term due to dislocations inMn12acetate crystals directly observed by EPR spectroscopy

2001/11/12 by R. Amigó, R. Amigo, E. del Barco +12
Biochemistry, Genetics and Molecular Biology · Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Electron Spin Resonance Studies #Magnetism in coordination complexes #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.65.172403

13 pages and 4 figures

arxiv created 2001/11/12 · openalex publication_date 2002/04/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

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_x²\ensuremath-S_y²) transverse anisotropy term in the spin Hamiltonian. From the behavior 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^\ensuremath-3.

Citations

• Effects ofD-strain,g-strain, and dipolar interactions on EPR linewidths of the molecular magnetsFe8andMn12
• Experimental evidence of the dependence of spin tunnelling on the concentration of dislocations in Mn12 crystals

Cited by

• Crystal defects and spin tunneling in single crystals ofMn12clusters