Relaxation and Landau-Zener experiments down to 100 mK in ferritin
M. Duran, E. del Barco, J. M. Hernandez, J. Tejada
Abstract
Temperature-independent magnetic viscosity in ferritin has been observed from 2 K down to 100 mK, proving that quantum tunneling plays the main role in these particles at low temperature. Magnetic relaxation has also been studied using the Landau-Zener method making the system crossing zero resonant field at different rates, alpha=dH/dt, ranging from 10-5 to 10-3 T/s, and at different temperatures, from 150 mK up to the blocking temperature. We propose a new Tln(Delta Heff/tau0 alpha) scaling law for the Landau-Zener probability in a system distributed in volumes, where Delta Heff is the effective width of the zero field resonance.
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