The origin of the nonmagnetic phase transition in PrTi 2Al 20, reported earlier in a macroscopic study, has been asserted microscopically using elastic and inelastic neutron scattering techniques. It has been shown spectroscopically that the crystalline-electric-field ground state is a nonmagnetic Γ 3 doublet, whereas the excited states are two triplets (Γ 4 and Γ 5) and a singlet (Γ 1). The diffraction experiment under external magnetic field shows that the nonmagnetic transition is indeed ferroquadrupolar ordering, which takes place as a consequence of cooperative removal of the ground-state-doublet degeneracy. It is therefore concluded that PrTi 2Al 20 is another rare example of Pr compounds exhibiting nonmagnetic quadrupolar order.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2012 Nov 16|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics