Neutron scattering study of spin fluctuations in Y(Mn/sub 1-//sub x/Al/sub x/)/sub 2/
Elastic and inelastic neutron-scattering measurements have been made on a series of pseudobinary intermetallic compounds Y(Mn/sub 1-//sub x/Al/sub x/)/sub 2/. Long-range antiferromagnetic order below T/sub N/approx.100 K in YMn/sub 2/ has been shown to collapse by substitution of only 5% of the manganese atoms by aluminum atoms. In these compounds, a spin-glass transition has been clearly indicated by a change in the energy width of the scattered-neutron spectrum, as well as by the onset of field hysteresis in susceptibility measurements. In the compound with x = 0.10, the amplitude of spin fluctuations S does not change appreciably with temperature, whereas in YMn/sub 2/ it drops by more than 30% at T/sub N/ and then increases gradually with increasing temperature. A considerable degree of spatial correlations of spin fluctuations persists up to at least 760 K, which is similar to the behavior observed in YMn/sub 2/ but quite different from the characteristics of simple localized-electron magnets.
- Research Organization:
- Department of Physics, Faculty of Science, Saitama University, 255 Shimo-Okubo, Urawa, Saitama 338, Japan
- OSTI ID:
- 7091976
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:7; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
ANGULAR MOMENTUM
COHERENT SCATTERING
CORRELATIONS
DIFFRACTION
ELASTIC SCATTERING
FLUCTUATIONS
HIGH TEMPERATURE
HYSTERESIS
INELASTIC SCATTERING
INTERMETALLIC COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MANGANESE ALLOYS
NEUTRON DIFFRACTION
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
POWDERS
SCATTERING
SPIN
SPIN GLASS STATE
VARIATIONS
X-RAY DIFFRACTION
YTTRIUM ALLOYS