title: Evidence for a non-Fermi-liquid phase in Ge-substituted YbRh2Si2.
abstract: The canonical view of heavy fermion quantum criticality assumes a single quantum critical point separating the paramagnet from the antiferromagnet. However, recent experiments on Yb-based heavy fermion compounds suggest the presence of non-Fermi liquid behavior over a finite zero-temperature region. Using detailed susceptibility and transport measurements we show that the classic quantum critical system, Ge-substituted YbRh(2)Si(2), also displays such behavior. We advance arguments that this is not due to a disorder-smeared quantum critical point, but represents a new class of metallic phase.
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040 Vienna, Austria.
authors.forename: J
authors.initials: J
authors.lastname: Custers
authors.forename: P
authors.initials: P
authors.lastname: Gegenwart
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: F
authors.initials: F
authors.lastname: Steglich
authors.forename: P
authors.initials: P
authors.lastname: Coleman
authors.forename: S
authors.initials: S
authors.lastname: Paschen