Abstract
We report the results of the specific heat measurements for PrTr2Al20 (Tr = Ti and V), both of which have the cubic nonmagnetic Γ3 ground state of the crystal electric field scheme. Sharp peak anomalies observed at T = 2.0 K for PrTi2Al20 and 0.6 K for PrV2Al20 indicate the second order phase transition due to the multipole degree of freedom. The application of the magnetic field along [111] does not change the anomalies observed in the specific heat of either PrTi2Al20 or PrV2Al20, suggesting the quadrupole nature of the phase transition. A large Sommerfeld coefficient γ found above the ordering temperature in PrTi2Al20 suggests heavy quasi particle formation due to the scattering process of conduction electrons by quadrupole moments.
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