Tunable Quantum Magnetism in Frustrated Yb-Based van der Waals Materials.
The border between magnetic order and a quantum disordered ground state is notoriously difficult to reach by design. Here we show that systematic anion substitution in a family of rare-earth van der Waals (vdW) magnets, YbChX (Ch = S, Se; X = Br, I), provides a direct chemical handle on this boundary. By replacing chal...