Periodic Instantons and Quantum-Classical Transitions in Spin Systems

• The tunneling splitting of the energy levels of a ferromagnetic particle in the presence of an applied magnetic field - previously derived only for the ground state with the path integral method - is obtained in a simple way from Schr"odinger theory. The origin of the factors entering the result is clearly understood, in particular the effect of the asymmetry of the barriers of the potential. The method should appeal particularly to experimentalists searching for evidence of macroscopic spin tunneling.

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Author: Jiu-Qing Liang, H. J. W. Müller-Kirsten, F. Zimmerschied, D.K. Park urn:nbn:de:hbz:386-kluedo-8640 Preprint English 1998 1998 Technische Universität Kaiserslautern 2000/04/03 Fachbereich Physik 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik Standard gemäß KLUEDO-Leitlinien vor dem 27.05.2011

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