Induced and cooperative order of Nd ions in NdNiO[sub 3].

Low-temperature specific heat measurements on NdNiO[sub 3] evidence the onset of Nd cooperative ordering at T[sub N2]=0.77 K. Because of the particular arrangement of the Ni magnetic moments, half of the Nd ions have an antiferromagnetically compensated environment while the other half have a noncompensated one. We show that both types of Nd ions are affected by a different but non-negligible Nd–Ni exchange field, in contrast with the current model used in literature.© 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]