Anisotropic exchange in frustrated pyrochlore Yb(2)Ti(2)O(7).
J Phys Condens Matter
; 21(49): 492202, 2009 Dec 09.
Article
em En
| MEDLINE
| ID: mdl-21836187
ABSTRACT
The local Yb(3+) magnetic susceptibility tensor was recently measured in the frustrated pyrochlore compound Yb(2)Ti(2)O(7) by means of in-field polarized neutron scattering in a single crystal. A very anisotropic effective exchange tensor was derived for the Yb(3+) ion. Using this result, we reinterpret here the data for the powder susceptibility in Yb(2)Ti(2)O(7). We show that, in the case of a well-isolated Kramers doublet with anisotropic g and exchange tensors, the inverse susceptibility for a powder sample does not strictly obey a Curie-Weiss law at low temperature. We discuss the consequences regarding the paramagnetic Curie temperature, usually taken as a measure of the exchange/dipolar interaction, and the exotic 'slow fluctuation' ground state of Yb(2)Ti(2)O(7).
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Phys Condens Matter
Ano de publicação:
2009
Tipo de documento:
Article