Extreme Field Sensitivity Of Magnetic Tunneling In Fe-Doped Li3 N

Abstract

The magnetic properties of dilute Li2(Li1-xFex)N with x∼0.001 are dominated by the spin of single, isolated Fe atoms. Below T=10 K the spin-relaxation times become temperature independent indicating a crossover from thermal excitations to the quantum tunneling regime. We report on a strong increase of the spin-flip probability in transverse magnetic fields that proves the resonant character of this tunneling process. Longitudinal fields, on the other hand, lift the ground-state degeneracy and destroy the tunneling condition. An increase of the relaxation time by 4 orders of magnitude in applied fields of only a few milliTesla reveals exceptionally sharp tunneling resonances. Li2(Li1-xFex)N represents a comparatively simple and clean model system that opens the possibility to study quantum tunneling of the magnetization at liquid helium temperatures.

Publication Date

4-4-2018

Publication Title

Physical Review Letters

Volume

120

Issue

14

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevLett.120.147202

Socpus ID

85045022263 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85045022263

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