Pressure Effect on the Magnetic Transitions in Nd7Ni3 Single Crystal

Magnetic phase transitions in Nd7Ni3 under hydrostatic pressure have been studied by measuring the electrical resistivity up to 30 kbar using a clamp type pressure cell. From the previous reports at ambient pressure, Nd7Ni3 possesses two ferrimagnetic states; Ferri I below T-R = 7.8 K and Ferri II between T-R and T-C = 12 K. More two antiferromagnetic states exist between T-C and T-t = 25 K (AF I) and from T-t to T-N = 28 K (AFII). Electrical resistivity shows anomalies at T-R, T-t and T-N along the c-axis and in the c-plane. Under hydrostatic pressure, the Ferri II and the AF II states disappear; the AF I and the AF II states are stabilized.