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The synthesis and physical properties of the double perovskite (DP) compoundBa2CdReO6 with the 5d1 electronic configuration are reported. Three successivephases originating from a spin-orbit-entangled Jeff = 3/2 state, confirmed bythe reduced effective magnetic moment of 0.72 {\mu}B, were observed uponcooling. X-ray diffraction measurements revealed a structural transition from ahigh-temperature cubic structure to a low-temperature tetragonal structure atTs = 170 K, below which the Jeff = 3/2 state was preserved. Magnetization, heatcapacity, and thermal expansion measurements showed two more electronictransitions to a possible quadrupole ordered state at Tq = 25 K, and anantiferromagnetic order of dipoles accompanied by a ferromagnetic moment of ~0.2 {\mu}B at Tm = 12 K. These properties were compared with those of thesister compounds Ba2BReO6 (B = Mg, Zn, and Ca) and the chemical trend isdiscussed in terms of the mean-field theory for spin-orbit-coupled 5d electrons[G. Chen et al., Phys. Rev. B 82, 174440 (2010)]. The DP compound Ba2BReO6provides a unique opportunity for a systematic investigation on symmetrybreaking in the presence of multipolar degrees of freedom.

Possible quadrupole order in tetragonal Ba2CdReO6 and chemical trend in the ground states of 5d1 double perovskites