Electrical resistivities of single-crystal PrTiO3 and NdTiO3. Magnetic properties of PrTiO3, NdTiO3, PrScO3, and NdScO3

Electrical resistivities were measured as a function of temperature in the range below 300 K for single-crystal samples of PrTiO3 and NdTiO3. Both materials are semiconductors with room temperature activation energies of 0.03 to 0.04 eV. Magnetic susceptibilities for PrTiO3 and NdTiO3 follow the Curie-Weiss law at high temperatures with Cm = 1.73(3) and Θc = −49(3) K (PrTiO3), and Cm = 1.77(3), Θc = −35(3) K (NdTiO3). For PrScO3 and NdScO3, isostructural materials, magnetic-susceptibility data also follow the Curie-Weiss law with Cm = 1.34(3) and Θc = −8(2) K (PrScO3) and Cm = 1.51(3) and Θc = −32(3) K (NdScO3). Assuming that the data for PrScO3 and NdScO3 represent a fair approximation to the rare-earth-only susceptibility, a Ti(III) contribution to the susceptibilities of PrTiO3 and NdTiO3 can be estimated and these are found to be near the spin-only value. PrTiO3 shows complex magnetic order below 96(2) K, while NdTiO3 shows no obvious sign of order above 4.2 K.