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oai:recercat.cat:2445/221062025-12-04T20:44:35Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Obradors, Xavier author Martínez Perea, Benjamin author Batlle Gelabert, Xavier author Rodríguez Carvajal, Juan author Fernández-Diaz, M. T. author Martínez, J. L. author Odier, P. author 2012-02-16T08:49:44Z 2012-02-16T08:49:44Z 1991 The magnetic properties of a stoichiometric Pr2NiO4 single crystal have been examined by means of the temperature dependence of the complex ac susceptibility and the isothermal magnetization in fields up to 200 kOe at T=4.2 K. Three separate phases have been identified and their anisotropic character has been analyzed. A collinear antiferromagnetic phase appears first between TN = 325 K and Tc1 = 115 K, where the Pr ions are polarized by an internal magnetic field. At Tc1 a first modification of the magnetic structure occurs in parallel with a structural phase transition (Bmab to P42/ncm). This magnetic transition has a first‐order character and involves both the out‐of‐plane and the in‐plane spin components (magnetic modes gx and gxcyfz, respectively). A second magnetic transition having also a first‐order character is also clearly identified at Tc2 = 90 K which corresponds to a spin reorientation process (gxcyfz to cxgyaz magnetic modes). It should be noted as well that the out‐of‐phase component of χac shows a peak around 30 K which reflects the coexistence of both magnetic configurations in a wide temperature interval. Finally, two field‐induced transitions have been observed at 4.2 K when the field is directed along the c axis. We propose that the high‐field anomaly arises from a metamagnetic transition of the weak ferromagnetic component, similarly to La2CuO4. Propietats magnètiques Anisotropia Ferromagnetisme Spin (Física nuclear) Cristal·lografia Matèria condensada Magnetic properties Anisotropy Ferromagnetism Nuclear spin Cristallography Condensed matter Magnetic transitions in Pr2NiO4 single crystal