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Kramers degeneracy and relaxation in vanadium, niobium and tantalum clusters
- Source :
- New Journal of Physics, Vol 20, Iss 4, p 043042 (2018)
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- In this work we use magnetic deflection of V, Nb, and Ta atomic clusters to measure their magnetic moments. While only a few of the clusters show weak magnetism, all odd-numbered clusters deflect due to the presence of a single unpaired electron. Surprisingly, for the majority of V and Nb clusters an atomic-like behavior is found, which is a direct indication of the absence of spin–lattice interaction. This is in agreement with Kramers degeneracy theorem for systems with a half-integer spin. This purely quantum phenomenon is surprisingly observed for large systems of more than 20 atoms, and also indicates various quantum relaxation processes, via Raman two-phonon and Orbach high-spin mechanisms. In heavier, Ta clusters, the relaxation is always present, probably due to larger masses and thus lower phonon energies, as well as increased spin–orbit coupling.
- Subjects :
- magnetism
Kramers degeneracy
metallic clusters
Science
Physics
QC1-999
Subjects
Details
- Language :
- English
- ISSN :
- 13672630
- Volume :
- 20
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- New Journal of Physics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f7c236bab96438faac59831ddeec528
- Document Type :
- article
- Full Text :
- https://doi.org/10.1088/1367-2630/aab5ca