Dipolar-controlled spin tunneling and relaxation in molecular magnets
Department of Physics and Astronomy, Lehman College, City University of New York, 250, Bedford Park Boulevard West, Bronx, 10468 New York, USA
Received: 13 October 2011
Received in final form: 9 February 2012
Published online: 28 March 2012
Spin tunneling in molecular magnets controlled by dipole-dipole interactions (DDI) in the disordered state has been considered numerically on the basis of the microscopic model using the quantum mean-field approximation. In the actual case of a strong DDI, coherence of spin tunneling is completely lost and there is a slow relaxation of magnetization, described by t3/4 at short times. Fast precessing nuclear spins, included in the model microscopically, only moderately speed up the relaxation.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012