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Revisited magnetic phase diagram for CeNi1-xCux system: spin-glass in the weak interaction limit

Abstract: We report the revisited magnetic phase diagram for the Kondo (ferromagnetic and antiferromagnetic) CeNi1?xCux series based on ac?dc magnetization, heat capacity, neutron diffraction and muon spectroscopy down to very low temperatures (?100 mK). An evolution from antiferromagnetism, observed for Cu-rich alloys (0.8 ? x ? 1), to clustered-ferromagnetism, seen for samples with 0.3 ? x ? 0.6, and then to spin-glass for 0.1 ? x ? 0.2, has been observed. The clustered-ferromagnetic phase emerges from a cluster-glass state without any indication of Curie temperature. For the samples adjacent to the magnetic?nonmagnetic crossover 0.1 ? x ? 0.2, only the cluster-glass state is observed due to the weakening of the RKKY interactions. We discuss the emerging phenomena taking into account the cluster-percolative scenario proposed for this series and the role of the interactions involved along the whole series. The proximity to a T = 0 K spin-glass quantum phase transition in the phase diagram is discussed.

 Authorship: Marcano N., Espeso J., Gómez Sal J.,

 Fuente: Journal of Physics Condensed Matter, 2013, 25(48),484004

 Publisher: IOP Publishing

 Publication date: 04/12/2013

 No. of pages: 6

 Publication type: Article

 DOI: 10.1088/0953-8984/25/48/484004

 ISSN: 0953-8984,1361-648X

 Spanish project: MAT2011-27573

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