NMR evidence of pressure-induced structural transition and enhanced spin fluctuations up to 14 GPa in SrCu 2 (BO 3) 2
High-pressure NMR measurements up to 14 GPa revealed two pressure-induced monoclinic phases in SrCu2(BO3)2. These phases host a gapless 3D antiferromagnetic phase at low temperatures and an extended correlated paramagnetic regime at higher temperatures, providing a detailed picture of the material's structural and magnetic evolution under extreme pressure.