![]() The fluctuation temperature T sf ≈ 640 K ( Alleno et al., 1995a) is a measure of the hybridization interaction of the 4f electron with the conduction electrons. considering the thermal fluctuations together with quantum interconfiguration fluctuations ( Sales and Wohlleben, 1975). ![]() Here “non-magnetic” essentially means that the susceptibility has no Curie-like singularity but remains finite at zero temperature, which can be roughly described by replacing T by ( T + T sf), i.e. Magnetic susceptibility, specific heat and neutron diffraction experiments showed that Ce is essentially non-magnetic and there are no magnetic transitions in CeNi 2B 2C although, as discussed in Section 4.1, Ce 3+ is a Kramers ion and, therefore, it has a magnetic CEF ground state ( Alleno et al., 1995a Carter et al., 1995a Lynn et al., 1997). However, X-ray absorption spectroscopy at the Ce-L III edge ( Alleno et al., 1995a) yields a valence of Ce in CeNi 2B 2C of 3.26, which is slightly smaller than the well-known saturation value of 3.3 ( Röhler, 1987). The approximate valence Ce +3.75 obtained by interpolation points to an intermediate valence of cerium in this compound ( Siegrist et al., 1994a, 1994b). Neither the trivalent nor the tetravalent radius for Ce falls on the corresponding straight lines. The lattice parameters of CeNi 2B 2C do not fit the linear relationship found for the other RNi 2B 2C compounds (see Figure 29). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |