Local symmetry and crystalline field effects in charge-ordered Yb4As3

Citation
O. Sakai et al., Local symmetry and crystalline field effects in charge-ordered Yb4As3, J PHYS JPN, 69(11), 2000, pp. 3633-3641
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
ISSN journal
0031-9015 → ACNP
Volume
69
Issue
11
Year of publication
2000
Pages
3633 - 3641
Database
ISI
SICI code
0031-9015(200011)69:11<3633:LSACFE>2.0.ZU;2-9
Abstract
Yb4As3 exhibits very anisotropic magnetic properties, while its dynamic for m factor of the inelastic excitation spectra at very low temperatures are w ell described by an almost-isotropic one-dimensional Heisenberg model, whic h is supplemented by the Dzyaloshinsky-Moriya interaction. To clarify the o rigin of this feature, the crystalline field effects in the inelastic neutr on scattering and the magnetic susceptibility data of Yb4As3 are analyzed t o separate out the contribution of the lowest Kramers-doublet state from th ose of the crystalline field excited states. The isotropic excitation mode is ascribed to the former state. The excitation spectra specified by the ma gnetic polarization directions are also calculated to give additional infor mation of the crystalline field states. It is also pointed out that the mag netization parallel to the c-axis is induced for the magnetic field; which is applied perpendicular to the c-axis in the c-plane. Its magnitude is pro portional to the cube of the field strength. The internal field can have di fferent values on the two Yb3+ sites which are connected by the glide opera tion. It is shown that the magnetization can give us detailed information o f the local C-3 symmetry) around the Yb3+ site.