Open AccessTHERMALLY ASSISTED QUANTUM TUNNELING IN ANTIFERROMAGNETIC PARTICLES AND MACROSCOPIC QUANTUM EFFECT
Author(s) -
Yi-Hang Nie,
Yunbo Zhang,
Liang Jiu-Qing,
Pu Fu-Ke
Publication year - 1999
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.48.966
Subject(s) - quantum tunnelling , wkb approximation , condensed matter physics , excited state , antiferromagnetism , instanton , physics , quantum , quantum mechanics
Quantum tunneling effect at excited states in antiferromagnetic particles is studied with the help of the periodic instanton mdthod. The transition amplitude, energy shift and prefactor of WKB exponential are given for various low-lying excited states. The tunneling rate at definite temperature is obtained by statistical average and the theoretical dependence of the tunneling rate on temperature is in agreement with the experimental results.