skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on April 4, 2019

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