Ferro-quadrupolar ordering in PrTi${}_2$Al${}_{20}$

Abstract

Origin of the non-magnetic phase transition in PrTi${}_2$Al${}_{20}$, reported earlier in the 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 non-magnetic ${\Gamma }_3$ doublet, whereas the excited states are two triplets (${\Gamma }_4$ and ${\Gamma }_5$) and a singlet (${\Gamma }_1$). The diffraction experiment under external magnetic field shows that the non-magnetic transition is indeed ferro-quadrupolar ordering, which takes place as a consequence of cooperative removal of the ground-state-doublet degeneracy. It is therefore concluded that PrTi${}_2$Al${}_{20}$ is another rare example of Pr compounds exhibiting non-magnetic quadrupolar order.

7pages, 7 figure, and 1 table, submitted to PRB

References in corpus (2)

• Superconductivity in the Ferroquadrupolar State in the Quadrupolar Kondo Lattice PrTi${}_2$Al${}_{20}$
• Detection of Neutron Scattering from Phase IV of Ce0.7La0.3B6: A Confirmation of the Octupole Order

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