U Mossbauer Spectroscopy of Uranium Dipnictides

Hyperfine interactions at U nuclei in uranium dipnictides are correlated with the magnetic sequence in their antiferromagnetic states. Because of high Neel temperature, the lattice contribution in the EFG tensor is difficult to estimate. Therefore, it has not been clarified experimentally whether the nuclear quadrupole interaction is caused by the cancellation between the 5f quadrupole moments and lattice contributions or not Considering the crystal structure of the series of the uranium dipnictides, the pnictogen dependence of the lattice contribution in the EFG tensor is small. The results ofthe U Mossbauer spectroscopy imply that the electronic structure thataffects the hyperfine interactions at nuclei 

Mossbauer measurements of exotic uranium compounds were carried out in the present work. Systematic measurements of uranium intermetallics reveal that the hyperfine coupling constant is ISOTZ/te at uranium nuclei. This hyperfine coupling constant depends on the hybridization between 5f and conduction electrons as well as on the 

7 STUDY OF EXOTIC URANIUM COMPOUNDS USING U MOSSBAUER SPECTROSCOPY 

Greenwood, T.C. Gibb, Mossbauer Spectroscopy, Chapman and Hall, 1971. 

Nakada, M. Saeki, N.M. Masaki, S. Tsutsui,). Radioanal. NucL Cbem. 1998, 232, 201-207. 

---