Title:
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Magnetic transitions in Pr2NiO4 single crystal
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Author:
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Obradors, Xavier; Martínez Perea, Benjamin; Batlle Gelabert, Xavier; Rodríguez Carvajal, Juan; Fernández-Diaz, M. T.; Martínez, J. L.; Odier, P.
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Propietats magnètiques -Anisotropia -Ferromagnetisme -Spin (Física nuclear) -Cristal·lografia -Matèria condensada -Magnetic properties -Anisotropy -Ferromagnetism -Nuclear spin -Cristallography -Condensed matter |
Rights:
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(c) American Institute of Physics, 1991
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Document type:
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Article Article - Published version |
Published by:
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American Institute of Physics
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