Magnetothermal behavior of the two-dimensional triangular-lattice compounds RCuO2 [R=La, Pr, Nu, Eu, and (La0.2Gd0.8)]

Abstract

The magnetothermal properties of the Delafossite-type compounds R${\mathrm{CuO}}_2$, with R=La, Pr, Nd, Eu,and ${\mathrm{La}}_{0.2}$ ${\mathrm{Gd}}_{0.8}$ are presented. Particular attention is paid to the low-temperature cooperative behavior of this planar triangular system. Frustration is found to exist for the Kramers-ion compounds. For R=${\mathrm{La}}_{0.2}$ ${\mathrm{Gd}}_{0.8}$, a spin-glass-like behavior is found.