Quadrupole Excitation in Tunnel Splitting Oscillation in Nanoparticle 𝐌𝐧12
We analyze the interference between tunneling paths that occur for a spin system with special Hamiltonian both for dipole and quadrupole excitations. Using an instanton approach, we find that as the strength of the second-order transverse anisotropy is increased, the tunnel splitting for both excita...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2012-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2012/530765 |
| Summary: | We analyze the interference between tunneling paths that occur
for a spin system with special Hamiltonian both for dipole and quadrupole
excitations. Using an instanton approach, we find that as the strength
of the second-order transverse anisotropy is increased, the tunnel splitting for both excitations is modulated, with zeros occurring periodically and the number of quenching points for quadrupole excitation
decreasing. This effect results from the interference of four tunneling
paths connecting easy-axis spin orientations and occurs in the absence
of any magnetic field. |
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| ISSN: | 1687-8108 1687-8124 |