Muon-spin relaxation in AuFe and CuMn spin glasses

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.546· OSTI ID:6068855

Uemura, Y J; Yamazaki, T; Harshman, D R; Senba, M; Ansaldo, E J

Zero- and longitudinal-field muon-spin relaxation (ZF ..mu..SR and LF ..mu..SR) measurements have been applied to dilute-alloy spin glasses AuFe(1.0 and 1.4 at %) and CuMn(1.1, 3, and 5 at. %). A stochastic theory of muon-spin relaxation has been formulated, and an analytic form of zero-field (ZF) muon-spin-relaxation function has been derived to describe the depolarization of muon spins in static, dynamic, and coexisting static and dynamic random local fields from magnetic impurities. The observed experimental results for the muon-spin-relaxation function G/sub z/(t) in all the specimens have been well explained by the model functions based on the present theory. Depolarization of muon spins due to the rapidly fluctuating dynamic local field has been indicated by the ''root-exponential'' shape of G/sub z/(t) observed above the susceptibility-cusp temperature T/sub g/. The spin correlation time tau/sub c/ of Mn (or Fe) moment, deduced from the dynamic depolarization rate of muon spins, shows a rapid change from tau/sub c/approx.10/sup -12/ sec at T> or approx. =2T/sub g/ towards tau/sub c/approx.10/sup -9/ sec at Tapprox.T/sub g/ in all the specimens. Coexistence of static and dynamic random fields at each muon site has been found by ZF and LF ..mu..SR below T/sub g/.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973 and Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
• OSTI ID: 6068855
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANGULAR MOMENTUM
COPPER ALLOYS
DATA
DILUTE ALLOYS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
GOLD ALLOYS
INFORMATION
IRON ALLOYS
LEPTONS
MAGNETIC RESONANCE
MANGANESE ALLOYS
MOESSBAUER EFFECT
MUONS
NUMERICAL DATA
PARTICLE PROPERTIES
RELAXATION
RESONANCE
SPIN
SPIN GLASS STATE
STOCHASTIC PROCESSES
TEMPERATURE DEPENDENCE