Observation of isotropic critical spin fluctuations in Gd

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.33.4747· OSTI ID:6087429

Collins, G S; Chowdhury, A R; Hohenemser, C

Perturbed ..gamma gamma.. angular-correlation experiments on oriented single crystals of Gd, containing 1 ppb of /sup 111/In, demonstrate that critical spin fluctuations are isotropic to within about 1 K above the Curie temperature. Closer to T/sub C/ we find evidence that the critical spin fluctuations fall increasingly along the c axis. Analysis of nuclear relaxation times in the isotropic region leads to spin autocorrelation times that diverge with an exponent w = 0.53(8). This value is not consistent with either spin-nonconserved Heisenberg behavior or Ising behavior, but agrees with Moessbauer data for Gd /sup 161/Dy.

• Research Organization: Department of Physics, Clark University, Worcester, Massachusetts 01610
• OSTI ID: 6087429
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 33:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ANGULAR CORRELATION
ANGULAR MOMENTUM
CORRELATIONS
CRYSTAL MODELS
CRYSTALS
ELEMENTS
FLUCTUATIONS
GADOLINIUM
HEISENBERG MODEL
IMPURITIES
INDIUM
ISOTROPY
MATHEMATICAL MODELS
METALS
MOESSBAUER EFFECT
MONOCRYSTALS
PARTICLE PROPERTIES
PERTURBED ANGULAR CORRELATION
RARE EARTHS
SPIN
TRACE AMOUNTS
VARIATIONS