Crystal-Field Excitations, Magnetic-Field-Induced Phase Transition and Neutron-Scattering Spectra in PrOs4Sb12 One possible origin of the field-induced ordered phase (FIOP) in PrOs4Sb12 is an interaction of quadrupolar moments of Pr 4f electrons in the singlet鈥搕ri... R Shiina,M Matsumoto,M ...