On the low-temperature properties of TmRu2Si2

Magnetic, electrical transport and heat capacity measurements have been performed on polycrystalline sample of the compound TmRu2Si2, which crystallizes with the tetragonal ThCr2Si2-type crystal structure. The results show paramagnetic behaviour down to 0.3 K, at variance with the literature data. On the basis of the collected data, possible origins of non-magnetic behaviour are discussed. Mixed valence of Tm ions or hybridisation between Tm 4f and Ru 4d states are the most probable reasons for paramagnetic behaviour of the TmRu2Si2.