Thermally assisted quantum tunneling in antiferromagnetic particles and macroscopic quantum effect

Authors
Nie, YH Zhang, YB Liang, JQ Pu, FK
Citation
Yh. Nie et al., Thermally assisted quantum tunneling in antiferromagnetic particles and macroscopic quantum effect, ACT PHY C E, 48(5), 1999, pp. 966-972
Citations number
16
Categorie Soggetti
Physics
Journal title
WULI XUEBAO
ISSN journal
10003290 → ACNP
Volume
48
Issue
5
Year of publication
1999
Pages
966 - 972
Database
ISI
SICI code
1000-3290(199905)48:5<966:TAQTIA>2.0.ZU;2-2
Abstract
Quantum tunneling effect at excited states in antiferromagnetic particles i s studied with the help of the periodic instanton method. The transition am plitude, energy shift and prefactor of WKB exponential are given for variou s low-lying excited states. The tunneling rate at definite temperature is o btained by statistical average and the theoretical dependence of the tunnel ing rate on temperature is in agreement with the experimental results.