Extreme field-sensitivity of the magnetic tunneling in Fe-doped Li${}_3$N

Abstract

The magnetic properties of dilute Li${}_2$(Li${}_{1-x}$Fe${}_x$)N with $x\sim 0.001$ 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 $\text{transverse}$ magnetic fields that proves the resonant character of this tunneling process. $\text{Longitudinal}$ fields, on the other hand, lift the ground-state degeneracy and destroy the tunneling condition. An increase of the relaxation time by four orders of magnitude in applied fields of only a few milliTesla reveals exceptionally sharp tunneling resonances. Li${}_2$(Li${}_{1-x}$Fe${}_x$)N represents a comparatively simple and clean model system that opens the possibility to study quantum tunneling of the magnetization at liquid helium temperatures.

arXiv comment6 pages, 3 figures, accepted for Phys. Rev. Lett

References in corpus (23)

• Quantum Computing in Molecular Magnets
• Magnetic qubits as hardware for quantum computers
• Suppression of tunneling by interference in half-integer--spin particles
• Destructive quantum interference in spin tunneling problems
• Rare-earth solid-state qubits
• Spin amplification, reading, and writing in transport through anisotropic magnetic molecules
• Nuclear spin driven quantum relaxation in LiY_0.998Ho_0.002F_4
• Berry Phase Oscillations of the Kondo Effect in Single-Molecule Magnets
• Spin tunneling via dislocations in Mn-12 acetate crystals
• Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate
• Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li_{1-x}Fe_x)N
• The quantum dynamics of atomic magnets, co-tunneling and dipolar-biased tunneling
• Band-filling effect on magnetic anisotropy using a Green's function method
• Single crystal growth from light, volatile, and reactive materials using lithium and calcium flux
• Spin-Orbit Qubits of Rare-Earth-Metal Ions in Axially Symmetric Crystal Fields
• Cross-relaxation and phonon bottleneck effects on magnetization dynamics in LiYF4:Ho3+
• Alternating magnetic anisotropy of Li${}_2$(Li${}_{1-x}{T}_x$)N with $T$ = Mn, Fe, Co, and Ni
• Resonant Magnetization Tunneling in Mn12 Acetate: The Absence of Inhomogeneous Hyperfine Broadening
• Experimental determination of the dipolar field in Mn12-acetate
• Geometric-Phase-Effect Tunnel-Splitting Oscillations in Single-Molecule Magnets with Fourth-Order Anisotropy Induced by Orthorhombic Distortion
• Three-Leaf Quantum Interference Clovers in a Trigonal Single-Molecule Magnet
• Spin-reversal energy barriers of 305 K for Fe${}^{2+}$ $d^6$ ions with linear ligand coordination
• Ferromagnetism or slow paramagnetic relaxation in Fe-doped Li${}_3$N?

Cited by in corpus (5)

• New Materials Physics
• Magnetic Field tuning of low energy spin dynamics in the single-atomic magnet Li${}_2$(Li${}_{1-x}$Fe${}_x$)N
• Ferromagnetic ordering of linearly coordinated Co ions in LiSr${}_2$[CoN${}_2$]
• Multipartite Entanglement and Quantum Sensing in a Spin-5/2 Heisenberg Molecular Iron(III) Triangle
• Cooperative quantum tunneling of the magnetization in Fe-doped Li${}_3$N