title: Quantum criticality in the cubic heavy-fermion system CeIn3-xSnx.
abstract: We report a comprehensive study of CeIn3-xSnx (0.55<or=x< or=0.8) single crystals close to the antiferromagnetic quantum-critical point (QCP) at xc approximately 0.37 by means of the low-temperature thermal expansion and Grüneisen parameter. This system represents the first example for a cubic heavy fermion in which TN can be suppressed continuously down to T=0. A characteristic sign change of the Grüneisen parameter between the antiferromagnetic and paramagnetic states indicates the accumulation of entropy close to the QCP. The observed quantum-critical behavior is compatible with the predictions of the itinerant theory for three-dimensional critical spin fluctuations. This has important implications for the role of the dimensionality in heavy-fermion QCPs.
authors.affiliation: Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Küchler
authors.forename: P
authors.initials: P
authors.lastname: Gegenwart
authors.forename: J
authors.initials: J
authors.lastname: Custers
authors.forename: O
authors.initials: O
authors.lastname: Stockert
authors.forename: N
authors.initials: N
authors.lastname: Caroca-Canales
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: J G
authors.initials: JG
authors.lastname: Sereni
authors.forename: F
authors.initials: F
authors.lastname: Steglich