title: YbRh(2)Si(2): pronounced non-fermi-liquid effects above a low-lyingmagnetic phase transition.
abstract: We report the first observation of non-Fermi-liquid (NFL) effects in a clean Yb compound at ambient pressure and zero magnetic field. The electrical resistivity and the specific-heat coefficient of high-quality single crystals of YbRh(2)Si(2) present a linear and a logarithmic temperature dependence, respectively, in more than a decade in temperature. We ascribe this NFL behavior to the presence of (presumably) quasi-2D antiferromagnetic spin fluctuations related to a very weak magnetic phase transition at T(N) approximately 65 mK. Application of hydrostatic pressure induces anomalies in the electrical resistivity, indicating the stabilization of magnetic order.
authors.affiliation: Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Trovarelli
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: S
authors.initials: S
authors.lastname: Mederle
authors.forename: C
authors.initials: C
authors.lastname: Langhammer
authors.forename: F M
authors.initials: FM
authors.lastname: Grosche
authors.forename: P
authors.initials: P
authors.lastname: Gegenwart
authors.forename: M
authors.initials: M
authors.lastname: Lang
authors.forename: G
authors.initials: G
authors.lastname: Sparn
authors.forename: F
authors.initials: F
authors.lastname: Steglich