Bakharev O.; Dooglav A.; Egorov A.; Lütgemeier H.; Rodionova M.; Teplov M.; Volodin A.; Wagener D.
(1992)
Many of presently known high-Tc superconductors contain rare-earth (RE) ions with an even number of electrons in an unfilled 4f-shell (Pr3+, Tb3+, Ho3+, Tm3+). If the ground state of 4f-electrons is non-degenerate and ...