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Title

Macroscopic quantum coherence in antiferromagnetic molecular magnets

Author(s)

Hu, Hui;  Lu, Rong;  Zhu, Jia-Lin;  Xiong, Jia-Jiong

Abstract

The macroscopic quantum coherence in a biaxial antiferromagnetic molecular magnet in the presence of magnetic field acting parallel to its hard anisotropy axis is studied within the two-sublattice model. On the basis of instanton technique in the spin-coherent-state path-integral representation, both the rigorous Wentzel-Kramers-Brillouin exponent and pre-exponential factor for the ground-state tunnel splitting are obtained. We find that the quantum fluctuations around the classical paths can not only induce a new quantum phase previously reported by Chiolero and Loss (Phys. Rev. Lett. 80 (1998) 169), but also have great influence on the intensity of the ground-state tunnel splitting. Those features clearly have no analogue in the ferromagnetic molecular magnets. We suggest that they may be the universal behaviors in all antiferromagnetic molecular magnets. The analytical results are complemented by exact diagonalization calculation.

Publication type

Journal article

Source

Communications in Theoretical Physics, Vol. 36, no. 2 (2001), pp. 245-250

Publication year

2001

FOR Code(s)

01 Mathematical Sciences;  02 Physical Sciences

Keyword(s)

Ferromagnetism

Publisher

International Academic Publishers

ISSN

0253-6102

Publisher URL

http://ctp.itp.ac.cn/qikan/Epaper/zhaiyao.asp?bsid=2353

Copyright

Copyright © 2001 International Academic Publishers. The accepted manuscript of the paper is reproduced here in accordance with the copyright policy of the publisher.

Full text

Peer reviewed