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|Title:||Magnetic transitions in Pr2NiO4 single crystal|
Martínez Perea, Benjamin
Batlle Gelabert, Xavier
Rodríguez Carvajal, Juan
Fernández-Diaz, M. T.
Martínez, J. L.
Spin (Física nuclear)
|Publisher:||American Institute of Physics|
|Abstract:||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.|
|Note:||Reproducció del document publicat a: http://dx.doi.org/10.1063/1.349958|
|It is part of:||Journal of Applied Physics, 1991, vol. 70, núm. 10, p. 6329-6331|
|Appears in Collections:||Articles publicats en revistes (Física de la Matèria Condensada)|
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