Geometric-Phase-Effect Tunnel-Splitting Oscillations in Single-Molecule Magnets with Fourth-Order Anisotropy Induced by Orthorhombic Distortion

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We analyze the interference between tunneling paths that occurs for a spin system with both fourth-order and second-order transverse anisotropy. Using an instanton approach, we find that as the strength of the second-order transverse anisotropy is increased, the tunnel splitting is modulated, with zeros occurring periodically. This effect results from the interference of four tunneling paths connecting easy-axis spin orientations and occurs in the absence of any magnetic field.
6 pages, 5 eps figures. Version published in EPL. Expanded from v1: Appendix added, references added, 1 figure added, others modified cosmetically

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Mesoscale and Nanoscale Physics, Materials Science, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/228820

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0809.2289
 http://arxiv.org/abs/0809.2289
 EPL 86, 27002 (2009)
 doi:10.1209/0295-5075/86/27002

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arXiv