Neutron-scattering study of the random-exchange Ising system Fe[sub [ital x]]Zn[sub 1[minus][ital x]]F[sub 2] near the percolation threshold

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.5051· OSTI ID:6716741

Belanger, D P ^[1]; Yoshizawa, H ^[2]

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1. Physics Department, University of California Santa Cruz, Santa Cruz, California 95064 (United States) Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Institute for Solid State Physics, University of Tokyo, Roppongi, Tokyo 106 (Japan) Brookhaven National Laboratory, Upton, New York 11973 (United States)

Neutron-scattering measurements at [ital H]=0 in the dilute Ising antiferromagnet Fe[sub [ital x]]Zn[sub 1[minus][ital x]]F[sub 2], with [ital x]=0.25 and [ital x]=0.27, both concentrations above the percolation threshold [ital x][sub [ital p]]=0.24, show no long-range order upon cooling to [ital T]=2 K. For temperatures above the equilibrium boundary [ital T][sub eq]([ital H]), measured previously in magnetization studies of Fe[sub [ital x]]Zn[sub 1[minus][ital x]]F[sub 2] for [ital x]=0.25, the scattering line shapes at [ital H]=0 are adequately described by Lorentzian functions, whereas below they are better described by the sum of a Lorentzian and a squared Lorentzian. The linewidths above [ital T][sub eq](0) decrease with [ital T] as if approaching a phase transition, at [ital T][approx]12 K for [ital x]=0.27 and lower for [ital x]=0.25, but become limited at [ital T][sub eq](0). We will discuss these results in the context of other observations of spin-glass-like behavior observed in Fe[sub [ital x]]Zn[sub 1[minus][ital x]]F[sub 2] for 0.25[le][ital x][le]0.31. Comparison is made to an isomorphic, weakly anisotropic antiferromagnet and to Ising antiferromagnets with competing interactions.

• DOE Contract Number: FG03-87ER45324; AC02-76CH00016
• OSTI ID: 6716741
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:9; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ANTIFERROMAGNETIC MATERIALS
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IRON COMPOUNDS
IRON FLUORIDES
LINE WIDTHS
MAGNETIC MATERIALS
MATERIALS
MIXTURES
NEUTRON DIFFRACTION
NEUTRON SPECTROSCOPY
PHASE TRANSFORMATIONS
SCATTERING
SPECTROSCOPY
SPIN GLASS STATE
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC FLUORIDES
ZINC HALIDES