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Magnetic transitions in Pr2NiO4 single crystal
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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.
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OBRADORS, Xavier, MARTÍNEZ PEREA, Benjamin, BATLLE GELABERT, Xavier, RODRÍGUEZ CARVAJAL, Juan, FERNÁNDEZ-DIAZ, M. t., MARTÍNEZ, J. l., ODIER, P.. Magnetic transitions in Pr2NiO4 single crystal. _Journal of Applied Physics_. 1991. Vol. 70, núm. 10, pàgs. 6329-6331. [consulta: 25 de gener de 2026]. ISSN: 0021-8979. [Disponible a: https://hdl.handle.net/2445/22106]