Publication Date:
2015-04-02
Description:
The temperature dependence and the effect of pressure P up to 2 kbar on the magnetic susceptibility χ of the tetraborides SmB 4 and YbB 4 was studied. For the compound CeB 4 , the electronic structure and magnetic susceptibility were calculated from first principles as a function of the atomic volume. The results show that in the studied tetraborides, rare-earth ions (Ce 4+ , Sm 3+ and Yb 2.8+ ) exhibit different valence states, which determines the specific features of their magnetic properties. In particular, the obtained pressure derivatives of susceptibility dlnχ/d P for cerium, samarium and ytterbium tetraborides are −2, −0.6 and +2.7 (in units of Mbar −1 ), respectively, which are characteristic for the exchange-enhanced itinerant paramagnetism, Van Vleck ionic paramagnetism with a stable f -shell, and the magnetism of rare-earth ions in the intermediate valence state.
Print ISSN:
1063-777X
Electronic ISSN:
1090-6517
Topics:
Physics
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