Tunneling splittings in Mn 12 -acetate single crystals
| Autor: | D. N. Hendrickson, E. del Barco, Evan Rumberger, George Christou, Andrew D. Kent |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Intermolecular force Relaxation (NMR) FOS: Physical sciences General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Transverse plane Magnetic anisotropy Dipole Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Anisotropy Quantum Quantum tunnelling |
| Zdroj: | Europhysics Letters (EPL). 60:768-774 |
| ISSN: | 1286-4854 0295-5075 |
| Popis: | A Landau-Zener multi-crossing method has been used to investigate the tunnel splittings in high quality Mn$_{12}$-acetate single crystals in the pure quantum relaxation regime and for fields applied parallel to the magnetic easy axis. With this method several individual tunneling resonances have been studied over a broad range of time scales. The relaxation is found to be non-exponential and a distribution of tunnel splittings is inferred from the data. The distributions suggest that the inhomogeneity in the tunneling rates is due to disorder that produces a non-zero mean value of the average transverse anisotropy, such as in a solvent disorder model. Further, the effect of intermolecular dipolar interaction on the magnetic relaxation has been studied. Europhysics Letters (in press). 7 pages, including 3 figures |
| Databáze: | OpenAIRE |
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