Magnetic phase diagram of a spin-1/2 compound Rb₂Co₂(SeO₃)₃ona triangular lattice

Quantum spin liquid as a strong candidate for fault-tolerant quantum computation, has attracted intense investigation in recent years. One strong candidate to form the resonating valence bond state, one type of quantum spin liquid phases, is the quasi-2D low-spin system on a triangular lattice. Rb₂Co₂(SeO₃)₃ is such a system containing spin-1/2 Co²⁺ ions. The Rb atoms sit in between the triangular lattice planes, which reduces the 3D magnetic interactions, providing access to quasi-2D frustrated quantum magnetism. In this talk, we will present magnetization, magnetocaloric effect, and electrical capacitance measurement results of Rb₂Co₂(SeO₃)₃ up to a magnetic field of 60 T. Six magnetization plateaus were observed with a saturation magnetic field of 25 T parallel to the crystallographic c-axis. Features corresponding to the magnetization plateaus were also observed in the other measurements, indicating strong magneto-elastic coupling. We will discuss the details and show a comprehensive temperature-magnetic field phase diagram of Rb₂Co₂(SeO₃)₃.