Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-07-30
Phys. Rev. B 66, 092401 (2002)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages including 3 figure and 1 table. To appear in Physical Review B
Scientific paper
10.1103/PhysRevB.66.092401
Renormalized tunnel splitting with a finite distribution in the biaxial spin model for molecular magnets is obtained by taking into account the dipolar interaction of enviromental spins. Oscillation of the resonant tunnel splitting with a transverse magnetic field along the hard axis is smeared by the finite distribution which subsequently affects the quantum steps of hysteresis curve evaluated in terms of the modified Landau-Zener model of spin flipping induced by the sweeping field. We conclude that the dipolar-dipolar interaction drives decoherence of quantum tunnelling in molcular magnets Fe₈, which explains why the quenching points of tunnel spliting between odd and even resonant tunnelling predcited theoretically were not observed experimentally.
Chen Zhi-De
Liang Jing-Qiu
Shen Shun-Qing
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