Magnetic Properties of RXO_4 System

概要

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The magnetizations of phosphates and vanadates of rate-earth elements RXO_4 (R=Pr, Nd, Sm, Eu, Gd, Td, Dy, Ho, Er and Yb, and X=P and V) were studied in the temperature range of 1.9°K to 630°K. There were not found any magnetic transitions between 4.2°K and 630°K for all system, while F.F.Y. Wang et al. reported some antifettomagnetic transitions for GdPO_4, TbPO_4 (zircon structure) and DyPO_4 at 225°K, 415°K and 505°K, respectively. Below 4.2°K, TbPO_4 (zircon structure) and DyPO_4 showed the metamagnetic-like behaviours and seemed to have antiferromagnetic transition points between 1.9°K and 4.2°K. Above 200°K, the magnetizations of all materials followed the Curie-Weiss law. The slope of inverse susceptibility vs temperature plots suggest that the magnetic moments localized on these materials come from those of trivalent cations R^<3+>. The nuclear magnetic resonances (NMR) of P^<31> and V^<51> in these materials were measured at room temperature. The NMR shifts of P^<31> were very small (-0.015%∼+0.038%) and any resonances were not observed for DyPO_4, HoPO_4 and ErPO_4. As for the V^<51> NMR, no resonances were observed except for the NdVO_4, which was also small (-0.053%). No arguments were made for SmPO_4 and EnPO_4 because of their extremely small susceptibilities.
社団法人日本物理学会の論文
1970-04-05