Quantum Tunneling of Magnetization in Molecular Complexes with Large   Spins. Effect of the Environment
  We review the present state of theory and experiments on the quantum tunneling of magnetization in mesoscopic spin systems. Most attention is paid to the relaxation of magnetization in the molecular complexes Mn12 and Fe8. The role of the thermostat (phonons, nuclear spins, dipolar fields) is studied. 
Igor Tupitsyn (1,2,3) and Bernard Barbara (1) ((1) Laboratoire de   Magnetisme, Louis Neel; (2) Russian Research Center "Kur...