An alternate model for magnetization plateaus in the molecular magnet V_15

Details An alternate model for magnetization plateaus in the molecular magnet V_15 An alternate model for magnetization plateaus in the molecular magnet V_15

2000-11-02

arxiv.org/abs/cond-mat/0011031v1

J. Phys. Condens. Matter 13 (2001) 11717

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex, 4 pages, 5 eps figures

Scientific paper

10.1088/0953-8984/13/50/331

Starting from an antiferromagnetic Heisenberg Hamiltonian for the fifteen spin-1/2 ions in V_15, we construct an effective spin Hamiltonian involving eight low-lying states (spin-1/2 and spin-3/2) coupled to a phonon bath. We numerically solve the time-dependent Schrodinger equation of this system, and obtain the magnetization as a function of temperature in a time-dependent magnetic field. The magnetization exhibits unusual patterns of hysteresis and plateaus as the field sweep rate and temperature are varied. The observed plateaus are not due to quantum tunneling but are a result of thermal averaging. Our results are in good agreement with recent experimental observations.

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