Manifestation of Spin Selection Rules on the Quantum Tunneling of Magnetization in a Single-Molecule Magnet
| Autor: | Philip Stamp, David N. Hendrickson, Changhyun Koo, Stephen Hill, John Henderson, Igor S. Tupitsyn, E. del Barco, Patrick L. Feng |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Condensed matter physics General Physics and Astronomy 010402 general chemistry 01 natural sciences 0104 chemical sciences Magnetization Excited state Metastability 0103 physical sciences Molecular symmetry Condensed Matter::Strongly Correlated Electrons Single-molecule magnet 010306 general physics Quantum Quantum tunnelling Spin-½ |
| Zdroj: | Physical Review Letters. 103 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We present low temperature magnetometry measurements on a new Mn3 single-molecule magnet in which the quantum tunneling of magnetization (QTM) displays clear evidence for quantum mechanical selection rules. A QTM resonance appearing only at high temperatures demonstrates tunneling between excited states with spin projections differing by a multiple of three. This is dictated by the C3 molecular symmetry, which forbids pure tunneling from the lowest metastable state. Transverse field resonances are understood by correctly orienting the Jahn-Teller axes of the individual manganese ions and including transverse dipolar fields. These factors are likely to be important for QTM in all single-molecule magnets. |
| Databáze: | OpenAIRE |
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