Interplay of orbital and magnetic degrees of freedom in f-electron systems: The cases of PrPb3 and TmTe

Citation
T. Sakakibara et al., Interplay of orbital and magnetic degrees of freedom in f-electron systems: The cases of PrPb3 and TmTe, J PHYS JPN, 69, 2000, pp. 25-32
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
ISSN journal
0031-9015 → ACNP
Volume
69
Year of publication
2000
Supplement
A
Pages
25 - 32
Database
ISI
SICI code
0031-9015(200005)69:<25:IOOAMD>2.0.ZU;2-L
Abstract
Effect of magnetic field on the antiferro-quadrupolar (AFQ) phase in the cu bic compounds PrPb3 and TmTe has been studied by means of magnetization and specific heat measurements. In PrPb3, it is found that the AFQ transition temperature T-Q (=0.4 K at H=0) remarkably increases in magnetic field. Thi s behavior is well explained by antiferromagnetic interactions between the field-induced staggered magnetic moment in the AFQ phase. Analysis of the o bserved anisotropy T-Q([100])(H) > T-Q([110])(H), however, strongly suggest s the presence of a weak ferro-octupolar interaction. In TmTe, magnetic sus ceptibility chi(T) increases enormously on cooling and appears to diverge u pon an antiferromagnetic (AF) transition at T-N=0.22 K. The results imply t hat a ferromagnetic moment is induced in the AF phase by an alternating ani sotropy due to the preexisting AFQ order at T(Q)approximate to 1.8 K. This is possible when both AF and AFQ states are described by the same wave vect or, in agreement with recent neutron diffraction studies.