@article{oai:oist.repo.nii.ac.jp:00002395,
 author = {Li, Xiang and Cooper, S. E. and Krishnadas, A. and de la Torre, A. and Perry, R. S. and Baumberger, F. and Silevitch, D. M. and Hsieh, D. and Rosenbaum, T. F. and Feng, Yejun},
 issue = {20},
 journal = {Physical Review B},
 month = {Nov},
 note = {Protected by the interplay of on-site Coulomb interactions and spin-orbit coupling, Sr₂IrO₄ at high pressure is a rare example of a Mott insulator with a paramagnetic ground state. Here, using optical Raman scattering, we measure both the phonon and magnon evolution in Sr2IrO4 under pressure and identify three different magnetically-ordered phases, culminating in a spin-disordered state beyond 18 GPa. A strong first-order structural phase transition drives the magnetic evolution at ∼10 GPa with reduced structural anisotropy in the IrO₆ cages, leading to increasingly isotropic exchange interactions between the Heisenberg spins and a spin-flip transition to c-axis-aligned antiferromagnetic order. In the disordered phase of Heisenberg Jeff = 1/2 pseudospins, the spin excitations are quasielastic and continuous to 10 meV, potentially hosting a gapless quantum spin liquid in Sr₂IrO₄.},
 title = {Magnetic order, disorder, and excitations under pressure in the Mott insulator Sr2IrO4},
 volume = {104},
 year = {2021}
}