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Title:	Magnetic transitions in Nd2NiO4
Author:	Obradors, Xavier; Batlle Gelabert, Xavier; Rodríguez Carvajal, Juan; Martínez, J. L.; Vallet Regí, María; González Calbet, José María; Alonso, J. A. (Julio A.), 1948-
Other authors:	Universitat de Barcelona
Abstract:	Five different magnetic phase transitions have been identified and characterized in stoichiometric Nd 2 NiO 4 by means of magnetic-susceptibility and isothermal-magnetization measurements. A collinear antiferromagnetic ordering of Ni 2 + magnetic moments exists between T N 1 ≊320 K and T c 1 ≊130 K where an orthorhombic-to-tetragonal structural phase transition occurs. In this temperature range, Nd 3 + ions follow a simple paramagnetic Curie-Weiss-like behavior, while a weak ferromagnetic component appears below 130 K. An internal magnetic field on the Nd 3 + ions develops with this structural phase transition. Two additional transitions are observed at T c 2 ≊68 K and T c 3 ≊45 K which are characterized by a sudden increase of the weak ferromagnetic component. Finally, a peak of the differential susceptibility at T N 2 ≊11 K marks a long-range antiferromagnetic ordering of the Nd 3 + ions. The internal magnetic field acting on the Nd ions was evaluated to be 5.2 T in the 20 K– T c 2 temperature range.
Subject(s):	-Física de l'estat sòlid -Magnetisme -Solid state physics -Magnetism
Rights:	(c) The American Physical Society, 1991
Document type:	Article Article - Published version
Published by:	The American Physical Society
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