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Title: Extreme Field Sensitivity of Magnetic Tunneling in Fe-Doped Li 3 N

Here, the magnetic properties of dilute Li 2(Li 1–xFe x)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. Li 2(Li 1–xFe 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.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Univ. of Augsburg, Augsburg (Germany)
  2. Univ. of Central Florida, Orlando, FL (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9607
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
JE748/1; AC02-07CH11358; DMR-1503627; DMR-1630174
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1434308
Alternate Identifier(s):
OSTI ID: 1431396

Fix, M., Atkinson, J. H., Canfield, P. C., del Barco, E., and Jesche, Anton. Extreme Field Sensitivity of Magnetic Tunneling in Fe-Doped Li3N. United States: N. p., Web. doi:10.1103/PhysRevLett.120.147202.
Fix, M., Atkinson, J. H., Canfield, P. C., del Barco, E., & Jesche, Anton. Extreme Field Sensitivity of Magnetic Tunneling in Fe-Doped Li3N. United States. doi:10.1103/PhysRevLett.120.147202.
Fix, M., Atkinson, J. H., Canfield, P. C., del Barco, E., and Jesche, Anton. 2018. "Extreme Field Sensitivity of Magnetic Tunneling in Fe-Doped Li3N". United States. doi:10.1103/PhysRevLett.120.147202.
@article{osti_1434308,
title = {Extreme Field Sensitivity of Magnetic Tunneling in Fe-Doped Li3N},
author = {Fix, M. and Atkinson, J. H. and Canfield, P. C. and del Barco, E. and Jesche, Anton},
abstractNote = {Here, 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.},
doi = {10.1103/PhysRevLett.120.147202},
journal = {Physical Review Letters},
number = 14,
volume = 120,
place = {United States},
year = {2018},
month = {4}
}