Abstract
We present low-temperature specific heat, AC susceptibility, magnetisation andresistivity experiments on the intermetallic Laves phase compounds TmIr2 and TmRh2. Theexperimental susceptibility data below 1 K, both in zero and non-zero magnetic field, showfor TmIr2 a transition to a completely diamagnetic state at 0.25 K, indicating the presenceof bulk superconductivity below that temperature. For TmRh2 it is found that this compoundhas a singlet crystal field ground state. TmRh2 undergoes a transition to a ferromagneticinduced moment ordered state at 0.4 K. Based on an analysis of the specific heat data for thetwo compounds, several possible sets of crystal field parameters are discussed. It appears tobe necessary to include the effect of a distortion from cubic symmetry in the Hamiltonian,which is consistent with available Mössbauer data.
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