Ising versus XY anisotropy in frustrated R$_{2}$Ti$_{2}$O$_7$ compounds as seen by polarized neutrons

Autor:	Cao, H., Gukasov, A., Mirebeau, I., Bonville, P., Decorse, C., Dhalenne, G.
Rok vydání:	2009
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	We studied the field induced magnetic order in R$_{2}$Ti$_{2}$O$_7$ pyrochlore compounds with either uniaxial (R=Ho, Tb) or planar (R=Er, Yb) anisotropy, by polarized neutron diffraction. The determination of the local susceptibility tensor \{$\chi_\parallel,\chi_\perp$\} provides a universal description of the field induced structures in the paramagnetic phase (2-270 K), whatever the field value (1-7 T) and direction. Comparison of the thermal variations of $\chi_\parallel$ and $\chi_\perp$ with calculations using the rare earth crystal field shows that exchange and dipolar interactions must be taken into account. We determine the molecular field tensor in each case and show that it can be strongly anisotropic. Comment: 4 pages including 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0904.4440 Zobrazit plný text záznamu View this record from Arxiv