The Magnetic Properties of Some Rare Earth Oxides at Low Temperatures

Evaluation of a long-time temperature drift in a commercial Quantum Design MPMS SQUID magnetometer using as a standard

“…2). These data were taken after stabilizing at 50 K, cooling down to 2 K and taking data on warming, stabilizing temperature every 1 K up to 10 K, every 2.5 K up to 50 K and every 5 K up to 300 K. From the linear fit of the inverse susceptibility, χ −1 = H/M, the Gd 3+ effective moment was estimated to be µ ef f = 7.86 ± 0.05µ B , close to the theoretical value of 7.94 µ B for the Gd 3+ , with the Curie-Weiss temperature of Θ = −16.0 K, similar to the literature data [6,7,8,12].…”

“…In this work we address the issue of long-time temperature drift of a MPMS instrument using time-dependent DC magnetization measurements on Gd 2 O 3 , a very stable oxide with well-documented [6,7] Curie-Weiss-like temperaturedependent susceptibility that is known to be used for calibration of susceptibility measurements [8]. The use of magnetization measurements for temperaturedrift evaluation allows for the experimental protocol to be very similar to routine relaxation measurements and does not alter the thermal mass of the sample assembly.…”

Synthesis, structure and magnetic properties in the Nd2O3–Gd2O3 mixed system synthesized at 1200°C

“…Our measurements give a value of the ac susceptibility which is, on average, 3% smaller than the handbook value in the temperature range of interest [20,21]. Equivalently, dealing with a Nd 2 O 3 sample, which has on the contrary a smaller specific susceptibility and lower chemical stability especially to hydration in air [22], yielded an ac susceptibility value 6% on average smaller than the tabulated ones [20,21,23]. It must be pointed out anyway that the system reproducibility and accuracy is within r1.0%.…”