title: Enhanced electrical resistivity before Néel order in the metals RCuAs2 (R=Sm, Gd, Tb, and Dy).
abstract: We report an unusual temperature (T) dependent electrical resistivity (rho) behavior in a class of ternary intermetallic compounds of the type RCuAs2 (R=rare earths). For some rare earths (Sm, Gd, Tb, and Dy) with negligible 4f hybridization, there is a pronounced minimum in rho(T) far above respective Néel temperatures (T(N)). However, for the rare earths which are more prone to exhibit such a rho(T) minimum due to 4f-covalent mixing and the Kondo effect, this minimum is depressed. These findings, difficult to explain within the hitherto-known concepts, present an interesting scenario in magnetism.
authors.affiliation: Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India. sampath@tift.res.in
authors.forename: E V
authors.initials: EV
authors.lastname: Sampathkumaran
authors.forename: Kausik
authors.initials: K
authors.lastname: Sengupta
authors.forename: S
authors.initials: S
authors.lastname: Rayaprol
authors.forename: Kartik K
authors.initials: KK
authors.lastname: Iyer
authors.forename: Th
authors.initials: T
authors.lastname: Doert
authors.forename: J P F
authors.initials: JP
authors.lastname: Jemetio