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Spin-orbit coupling of as large as a half eV for electrons in 5$d$ orbitalsoften gives rise to the formation of spin-orbital entangled objects,characterized by the effective total angular momentum $J_{eff}$. Of particularinterest are the $J_{eff}$ = 3/2 states realized in 5$d^{1}$ transition metalions surrounded by an anion octahedron. The pure $J_{eff}$ = 3/2 quartet doesnot have any magnetic dipolar moment (<$M$> = 0) but hosts hiddenpseudo-dipolar moments accompanied by charge quadrupoles and magneticoctupoles. Cs$_2$TaCl$_6$ and Rb$_2$TaCl$_6$ are correlated insulators with5$d^{1}$ Ta$^{4+}$ ions in a regular Cl octahedron. Here we demonstrate thatthese Ta chlorides have a substantially suppressed effective magnetic dipolarmoment of ~ 0.2 ${\mu}_B$. Two phase transitions are observed at lowtemperatures that are not pronounced in the magnetization but accompanied withlarge electronic entropy of $R$ln4. We ascribe the two transitions to theordering of hidden multipoles.

Ordering of hidden multipoles in spin-orbital entangled 5$d^{1}$ Ta chlorides