Magnetic Properties of the Uranium Trichalcogenides
The magnetic investigations of the monoclinic uranium trichalcogenides until now have been carried out on powder samples only (Ref. 1 and references herein). They have revealed that the temperature dependence of the reciprocal susceptibility does not follow the Curie-Weiss law. UTe3 and USe3 exhibit maxima at 19.5 and 50 K, respectively, in the temperature dependence of the magnetic susceptibility, while US3 shows temperature independent paramagnetism below about 15 K. It is widely accepted that the low symmetry in which this group of compounds crystallizes does not support the creation of a long range magnetic order. Moreover, the temperature independent paramagnetism observed in the sulfide suggested that any magnetic ordering existing in the trichalcogenides should be of the induced type. Thus, the observed maxima have been discussed in terms of crystal field theory and the Fermi liquid model1. However, these preliminary experiments here show that this family of uranium compounds is extremely sensitive to oxidation, etc. Therefore, one can suspect that a few of the observed anomalies are parasitic effects. On the other hand, the examination of Pr has proven that the sample form has substantial importance for the magnetic properties (see Ref. 2 for other singlet-ground state materials). For this reason we have started the present investigation based on single crystal material. We have previously published the results of the electrical resistivity measurements obtained on the pseudosingle crystal of UTe3 3. From this examination we have concluded that UTe3 exhibits semiconducting character without any anomalies at low temperatures. In this paper we present the magnetic properties of uranium tritelluride and trisulphide examined in the temperature range 4.2–300 K and in magnetic fields up to 50 k0e. We have obtained also single crystals of USe3. However, because of the high reactivity of this compound we have not been able until now to provide safe conditions for measuring it.
KeywordsMagnetic Anomaly Electrical Resistivity Measurement Magnetic Field Direction Uranium Compound Single Crystal Material
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