Magnetic and Neutron Scattering Studies of Triangular-Lattice Magnet CeTa₇O₁₉

Geometrically frustrated magnets have attracted intense interest due to their ability to host a variety of exotic ground states, including spin-glass, magnetically ordered, and quantum spin liquid (QSL) phases. A QSL is an intriguing state of matter in which electron spins remain highly entangled without developing long-range magnetic order even at the lowest temperatures. We have successfully synthesized high-quality single crystals of the Ce-based triangular lattice compound CeTa₇O₁₉, where Ce³⁺ ions form a perfect two-dimensional triangular network. Comprehensive magnetic susceptibility, heat capacity, and neutron scattering measurements were performed on both powder and single-crystal samples. Our results reveal no evidence of long-range magnetic ordering down to 60 mK, suggesting that CeTa₇O₁₉ could be considered as a candidate for a quantum spin liquid ground state.