Title

Magnetic-field-modulated Kondo effect in a single-magnetic-ion molecule

Authors

Authors

J. I. Romero; E. Vernek; G. B. Martins;E. R. Mucciolo

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

NANOMAGNETS; RELAXATION; ANISOTROPY; COMPLEXES; SYSTEMS; Physics, Condensed Matter

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.

Journal Title

Physical Review B

Volume

90

Issue/Number

19

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000348767000005

ISSN

1098-0121

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