Quantum critical behavior in a CePt ferromagnetic Kondo lattice

• Autor(a) principal: Jiménez, Júlio Antonio Larrea
• Data de Publicação: 2005
• Outros Autores: Fontes, Magda Bittencourt, Alvarenga, Ana Paula Dornelles de, Saitovitch, Elisa Maria Baggio, Burghardt, Thorben, Eichler, Rolf Andreas, Continentino, Múcio Amado
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INMETRO
• Texto Completo: http://hdl.handle.net/10926/1267

Most of the studies of heavy fermions near a quantum critical point QCP have been carried out on antiferromagnetic systems. In this paper we report on the disappearance of ferromagnetic FM order in CePt as seen by the ac magnetic susceptibility and the electrical resistance measurements under pressures P up to 15 GPa. The pressure dependence of the Curie temperature TC P follows a typical Doniach’s phase diagram for Kondo lattice systems and it is consistent with a QCP at the critical pressure PC 12.1 GPa. The resistance in the vicinity of the QCP shows clearly a non-Fermi liquid NFL and beyond that a Fermi liquid FL state is recovered. A semiquantitative discussion on the nature of the vanishing of TC in a FM Ce Kondo lattice is given for the first time.