Coexistence of antiferromagnetism and spin-glass ordering in the Ising system Fe/sub 0/ /sub 55/Mg/sub 0/ /sub 45/Cl/sub 2/
Fe/sub 1-x/Mg/sub x/Cl/sub 2/ is a diluted Ising antiferromagnet with competing first and second neighbor exchange interactions. A previous magnetization study by Bertrand et al has found that at x approx. = 0.45, the system undergoes a Neel transition at T/sub N/ approx. = 7.4K which is followed by a spin-glass transition at T/sub sg/ approx. = 3.0K. We report a quasielastic neutron scattering study on a single crystal sample with this composition. We find that the antiferromagnetic Bragg peak persists down to 1.2K, well below T/sub sg/, and the diffuse scattering becomes temperature independent below about 6.0K, with the correlation length frozen at about 2.3 lattice spacings. No scattering related to the transverse spin-component are observed. These results suggests that there is coexistence between long range antiferromagnetic order and short-range spin-glass order for the longitudinal spin-component. Such a behavior is consistent with the predictions of the vector mean-field theory (infinite range model) for spin-glasses with strong unaxial anisotropy.
- Research Organization:
- Schlumberger-Doll Research Center, Ridgefield, CT (USA); Tokyo Univ. (Japan). Inst. for Solid State Physics; Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6224226
- Report Number(s):
- BNL-35480; CONF-841184-21; ON: DE85004164
- Resource Relation:
- Conference: 30. annual conference on magnetism and magnetic materials, San Diego, CA, USA, 27 Nov 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IRON CHLORIDES
ANTIFERROMAGNETISM
SPIN GLASS STATE
MAGNESIUM CHLORIDES
ISING MODEL
MONOCRYSTALS
NEEL TEMPERATURE
NEUTRON BEAMS
SCATTERING
ALKALINE EARTH METAL COMPOUNDS
BEAMS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL MODELS
CRYSTALS
HALIDES
HALOGEN COMPOUNDS
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNETISM
MATHEMATICAL MODELS
NUCLEON BEAMS
PARTICLE BEAMS
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TRANSITION TEMPERATURE
360603* - Materials- Properties