Abstract
The nonmagnetic doping effect of a TbB50-type compound TbB44Si2 was investigated. HC was interestingly observed to show no variation even for Tb1−xLuxB44Si2 (x=0.5) and a correlation was observed between the number of free Tb spins and x. The results indicate that the transition in the TbB50-type compounds is of a dimeric nature. Furthermore, irreversibilities were not observed in any of the compounds, which is further proof that disorder alone cannot be the driving force for glassiness in these boron cluster compounds of which new spin glasses such as REB22C2N (RE=rare-earth) have recently been discovered. Investigation of the evolution of the conductivity on the doping (which is a simple nonmagnetic substitution versus electronic doping) showed a dependency which directly reflected the introduction of disorder into the system.
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