Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-09-27
Physica B 270, 95-113(1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, Latex, 4 Postscript figures
Scientific paper
10.1016/S0921-4526(99)00161-1
Starting from the Hamiltonian operator of the noncompensated two-sublattice model of a small antiferromagnetic particle, we derive the effective Lagrangian of a biaxial antiferromagnetic particle in an external magnetic field with the help of spin-coherent-state path integrals. Two unequal level-shifts induced by tunneling through two types of barriers are obtained using the instanton method. The energy spectrum is found from Bloch theory regarding the periodic potential as a superlattice. The external magnetic field indeed removes Kramers' degeneracy, however a new quenching of the energy splitting depending on the applied magnetic field is observed for both integer and half-integer spins due to the quantum interference between transitions through two types of barriers.
Liang Jing-Qiu
Mueller-Kirsten Harald J. W.
Nie Yi-Hang
Pu Fu-Cho
Zhang Y.-B.
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