Enhanced electrical resistivity before Néel order in the metals RCuAs2 (R=Sm, Gd, Tb, and Dy).
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.
Sampathkumaran
E V
EV
Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India. sampath@tift.res.in
Sengupta
Kausik
K
Rayaprol
S
S
Iyer
Kartik K
KK
Doert
Th
T
Jemetio
J P F
JP