Specific heat of magnetic glass system LaAl2:Gd between 0.55 and 10 K

Specific-heat measurements between 0.55 and 10 K are reported for the alloy system LaA${\mathrm{l}}_2$:Gd for Gd concentrations of 0, 1.0, 2.0, and 3.0 at.%. Broad peaks associated with magnetic ordering between solute spins are observed and are consistent with models based on a Ruderman-Kittel-Kasuya-Yosida-like interaction. A concentration-independent linear term is observed at low temperatures and when compared with a molecular-field model yields $\left|J_{\mathrm{sf}}\right|=0.08\mathrm{}$ eV. An anomalous enhancement of the electronic-specific-heat term is also observed, but is smaller than expected from previous measurements on samples with lower concentrations.