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26 April 2024 |
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Macroscopic Quantum Coherence in Small Antiferromagnetic Particle and the Quantum Interference Effects | | Y.-H. Nie
; Y.-B. Zhang
; J.-Q. Liang
; H.J.W. Mueller-Kirsten
; F.-C. Pu
; | | Date: |
27 Sep 1999 | | Journal: | Physica B 270, 95-113(1999) | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | 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. | | Source: | arXiv, cond-mat/9909371 | | Services: | Forum | Review | PDF | Favorites | |
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