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We have investigated the physical properties of a pyrochlore hafnate Nd2Hf2O7using ac magnetic susceptibility \chi_ac(T), dc magnetic susceptibility\chi(T), isothermal magnetization M(H) and heat capacity C_p(T) measurements,and determined the magnetic ground state by neutron powder diffraction study.An upturn is observed below 6 K in C_p(T)/T, however both C_p(T) and \chi(T) donot show any clear anomaly down to 2 K. The \chi_ac(T) shows a well pronouncedanomaly indicating an antiferromagnetic transition at T_N = 0.55 K. The longrange antiferromagnetic ordering is confirmed by neutron diffraction. Therefinement of neutron diffraction pattern reveals an all-in/all-outantiferromagnetic structure, where for successive tetrahedra, the four Nd3+magnetic moments point alternatively all-into or all-out-of the tetrahedron,with an ordering wavevector k = (0, 0, 0) and an ordered state magnetic momentof m = 0.62(1) \mu_B/Nd at 0.1 K. The ordered moment is strongly reducedreflecting strong quantum fluctuations in ordered state.

Observation of long range magnetic ordering in pyrohafnate Nd2Hf2O7: A neutron diffraction study