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Magnetic transitions in Pr2NiO4 single crystal Obradors, Xavier Martínez Perea, Benjamin Batlle Gelabert, Xavier Rodríguez Carvajal, Juan Fernández-Diaz, M. T. Martínez, J. L. Odier, P. Propietats magnètiques Anisotropia Ferromagnetisme Spin (Física nuclear) Cristal·lografia Matèria condensada Magnetic properties Anisotropy Ferromagnetism Nuclear spin Cristallography Condensed matter 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. 2012-02-16T08:49:44Z 2012-02-16T08:49:44Z 1991 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: http://dx.doi.org/10.1063/1.349958 Journal of Applied Physics, 1991, vol. 70, núm. 10, p. 6329-6331 http://dx.doi.org/10.1063/1.349958 (c) American Institute of Physics, 1991 info:eu-repo/semantics/openAccess American Institute of Physics Articles publicats en revistes (Física de la Matèria Condensada)