DC magnetic susceptibility and neutron powder diffraction analysis of the perovskite-type compounds LaYbO3 and LaHoO3

Magnetization measurements and neutron powder diffraction analyses followed by Rietveld refinement have been carried out in order to investigate the magnetic structures of LaYbO3 and LaHoO3. Both compounds exhibit a negative thermal expansion along the a and b axes. In LaYbO3 Yb3C spins order at 2.4 K according to a FyGz-type structure, belonging to the Pn0ma0 magnetic space group. Conversely, LaHoO3 is paramagnetic down to 1.5 K.