Pressure dependent magnetic, AC susceptibility and electrical properties of Nd7Pd3

Abstract

The effects of pressure on the magnetization and isothermal entropy change, AC susceptibility, and resistivity for Nd₇Pd₃ have been studied. Nd₇Pd₃ shows three magnetic transitions T_t (=15 K), T_C (=34 K), and T_N (=38 K) at a pressure of zero bar. T_C and T_N are very sensitive to the pressure and rates of change of T_C and T_N with respect to pressure, i.e., dT_C/dp and dT_N/dp are −1.906 K kbar⁻¹ and −0.313 K kbar⁻¹ respectively, whereas T_t is insensitive to pressure change. It has also been observed that the isothermal entropy change is also sensitive to pressure. Below 15 K, an indication of spin glass nature in the AC susceptibility data is seen. The time dependent magnetization at low temperatures also supports the spin glass nature, but at high temperatures it indicates a complex nature. The electrical resistivity data has been fitted to the relation ρ = ρ₀ + AT² in the temperature range 12–30 K and ρ = ρ₀ + BT − CT³ in the temperature range 40–220 K. The M–H isotherm confirms the AFM nature of Nd₇Pd₃, which is confirmed further by the Arrott’s plot.