Effect of magnetic field on Nd0.7Pb0.3MnO3 single crystal

Abstract Magnetization and specific heat of Nd 0.7 Pb 0.3 MnO 3 single crystal are studied at applied magnetic field. Magnetization measurement at 0.3 T shows ferromagnetic phase below 150 K ( T C ) and below 20 K displays an antiferromagnetic component. The latter appears to be destroyed at 4.8 T. This anomalous increase below 50 K is probably due to reorientation of Nd moments at high magnetic field. Heat capacity has been measured at 0–10 T at low temperature. The data have been fitted to contributions from free electrons ( γ ), ferromagnetic spin excitations ( β 3/2 ), lattice and a Schottky-like anomaly related to the rare-earth magnetism of the Nd ions. Fitting yields that β 3/2 term is very small at 6 and 10 T because of introducing paramagnetic component in ferromagnetic phase at applied magnetic field. Peak due to Schottky anomaly is observed to be broadened with application of magnetic field and the magnitude of Schottky gap( Δ Sch ) also increases accordingly.