Fig. 4: The magnetic phase diagram of Na2Cu3Ge4O12.
From: Emergent many-body composite excitations of interacting spin-1/2 trimers
a The evolution of the magnetic field induced states as a function of the inter-trimer exchange coupling strength α = J2/J1 (for β = 0.18). With the increasing α value, the 1/3 magnetization plateau state becomes narrower. The vertical dashed line represents the position of Na2Cu3Ge4O12. b The solid blue curve is the calculated magnetization curve for Na2Cu3Ge4O12 having α = 0.18 [Fig. 1d] illustrating the different magnetic states, i.e., low magnetic state for M/Ms < 1/3, 1/3 magnetization plateau for M/Ms = 1/3, meta-magnetic state for 1/3 < M/Ms < 1 and saturation magnetization for M/Ms = 1.
