Year: 2014
Type: article
Abstract: We study numerically the low-temperature electronic transport properties of a single-ion magnet with uniaxial and transverse spin anisotropies. We find clear signatures of a Kondo effect caused by the presence of a transverse (zero-field) anisotropy in the molecule. This Kondo effect has an SU(2) pseudospin character, associated with a doublet ground state of the isolated molecule, which results from the transverse anisotropy. Upon applying a transverse magnetic field to the single-ion magnet, we observe oscillations of the Kondo effect due to the presence of diabolical points (degeneracies) of the energy spectrum of the molecule caused by geometrical phase interference effects, similar to those observed in the quantum tunneling of multi-ion molecular nanomagnets. The field-induced lifting of the ground-state degeneracy competes with the interference modulation, resulting in some cases in a suppression of the Kondo peak.
Source: Physical Review B
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: Materials World Network - Collaborative Research: Symmetry, Local-Environment and Time-Dependent Effects in Nanoscale Systems: A Synergistic Approach, MRI: Acquisition of a Computer Cluster for Multidisciplinary Physics Research, Collaborative Research: Molecular Spintronics with Single-Molecule Magnets
OpenAlex ID: W2053072824