Anomalous paramagnetic-state. mu. SR in spin-glass AgMn

Journal Article · Sun Mar 01 04:00:00 EST 1981 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.329707· OSTI ID:5883937

Brown, J A; Heffner, R H; Kitchens, T A; Leon, M; Olsen, C E; Schillaci, M E; Dodds, S A; MacLaughlin, D E

Muon spin rotation (..mu..SR) experiments have been carried out in the paramagnetic state (T> or approx. =T/sub g/) of a dilute AgMn spin glass, to probe internal field distributions during the onset of impurity-spin freezing. ..mu../sup +/ resonance frequencies and depolarization rates were measured in a 1.6 at.% Mn sample in transverse fields between 0.15 and 5 kOe for temperatures up to approx.3T/sub g/. The depolarization rate ..lambda.. increased well above the value ..lambda../sub d/ expected in the absence of impurity-spin exchange coupling as T/sub g/ was approached from above. The largest relative increase of ..lambda.. was obtained for lowest fields. The average precession frequency was constant to within 0.2% down to 1.1T/sub g/. The data scale roughly with T/T/sub g/ and H/T/sub g/ when compared to recent ..mu..SR studies of CuMn. Although a case has been made for attributing this anomamous increase in ..lambda.. to dynamic broadening (spin-lattice relaxation), evidence exists which argues that static inhomogeneity in the muon hyperfine field is the origin of ..lambda... If this is the case, the absence of muon environments with weak hyperfine couplings conflicts with the notion that clustering or percolative effects are involved in the spin-glass transition. The ..mu..SR results may be relevant to recent interpretations of ESR data.

• Research Organization: Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5883937
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 52:3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
DEPOLARIZATION
HYPERFINE STRUCTURE
MAGNETIC RESONANCE
MAGNETISM
MANGANESE ALLOYS
MUON PROBES
PARAMAGNETISM
PROBES
RESONANCE
SILVER ALLOYS
SILVER BASE ALLOYS
SPIN GLASS STATE