Large-field versus discontinuous instantons in spin orientation tunneling

2002/10/11 by Anupam Garg, Garg, Anupam, Ersin Keçecioğlu +1
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Quantum, superfluid, helium dynamics

paper · pdf · doi:10.48550/arxiv.cond-mat/0210277

openalex publication_date 2002/10/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Tunnel splitting oscillations in magnetic molecules are reconsidered within the simplest model for the problem, which does not contain fourth order anisotropy. It is shown that at large magnetic field, there is only one instanton, and it is continuous. This is in contrast to the discontinuous instantons that are induced by the fourth order term [Ersin Keçecioğlu and A. Garg, Phys. Rev. Lett. \bf 88, 237205 (2002)].

Related

• Spin Coherent-State Path Integrals and the Instanton Calculus
• Effects of arbitrarily directed field on spin phase oscillations in biaxial molecular magnets
• Multidimensional tunnelling of molecules aligned by strong electric fields
• Spin tunnelling in Molecular Magnets
• Transverse magnetization and transient oscillations in the quantum tunneling of molecular magnets