Spin dynamics of the concentrated spin glass Y(Mn sub 0. 9 Al sub 0. 1 ) sub 2
- Department of Physics, Saitama University, Urawa 338, Japan (JP)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000 (US)
- Department of Physics, San Diego State University, San Diego, California 92182-2222 (US)
Inelastic-neutron-scattering measurements employing polarization analysis have been performed on a pseudobinary intermetallic compound Y(Mn{sub 0.9}Al{sub 0.1}){sub 2}, which transforms to spin-glass state below {ital T}{sub SG}=42 K. The temperature variation of the energy width of the scattered neutron spectrum follows an Arrhenius law over a wide temperature range, and the width above {ital T}{sub SG} is much larger when compared with other concentrated spin glasses. The collapse of helical magnetic order caused by a slight dilution of the magnetic Mn atoms with nonmagnetic Al atoms and the very large excitation spectrum above {ital T}{sub SG} show that the itinerant character of magnetic electrons as well as the strong frustrations of magnetic interactions play an important role in this material. The importance of proper treatment of magnetic moments, taking into account the itinerent character of the magnetic electrons in metallic spin glasses, is discussed.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5777188
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 44:1; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
COHERENT SCATTERING
DIFFRACTION
FLUCTUATIONS
INTERMETALLIC COMPOUNDS
LAVES PHASES
MAGNETIC MOMENTS
MANGANESE ALLOYS
NEUTRON DIFFRACTION
SCATTERING
SPIN GLASS STATE
TERNARY ALLOY SYSTEMS
VARIATIONS
YTTRIUM ALLOYS