ANTIFERROMAGNETISM IN SOLID OXYGEN

Citation
Gd. Morris et al., ANTIFERROMAGNETISM IN SOLID OXYGEN, Hyperfine interactions, 104(1-4), 1997, pp. 381-385
Citations number
8
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Physics, Nuclear","Physics, Condensed Matter
Journal title
ISSN journal
03043843
Volume
104
Issue
1-4
Year of publication
1997
Pages
381 - 385
Database
ISI
SICI code
0304-3843(1997)104:1-4<381:AISO>2.0.ZU;2-Y
Abstract
Solid oxygen is known to have spontaneous antiferromagnetic order in i ts lowest temperature phase. Muons implanted in alpha-O-2 in zero appl ied magnetic field take up positions where the local held is non-zero and precess at a frequency proportional to the sublattice magnetisatio n. The reduction of the magnetisation as the temperature increases tow ard T-N is similar to that expected for the case of an anisotropic AFM coupling among spins of O-2 molecules. A fit to a simple non-interact ing, harmonic spin wave model yields an anisotropy-induced gap in the spin wave density of states E-g/k(B) = 80.5(6) K, implying a large ani sotropy constant K approximate to 16J.