title: Pressure induced second-order structural transition in Sr₃Ir₂O₇.
abstract: We conducted in situ angle dispersive high pressure x-ray diffraction experiments on Sr3Ir2O7 up to 23.1 GPa at 25 K with neon as the pressure transmitting medium. Pressure induces a highly anisotropic compressional behavior seen where the tetragonal plane is compressed much faster than the perpendicular direction. By analyzing different aspects of the diffraction data, a second-order structural transition is observed at approximately 14 GPa, which is accompanied by the insulating state to nearly metallic state at 13.2 GPa observed previously (Li et al 2013 Phys. Rev. B 87 235127). Our results highlight the coupling between electronic state and lattice structure in Sr3Ir2O7 under pressure.
authors.affiliation: Department of Physics, Stanford University, Stanford, CA 94305, USA. Photon Science and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Zhao
authors.forename: S
authors.initials: S
authors.lastname: Wang
authors.forename: T F
authors.initials: TF
authors.lastname: Qi
authors.forename: Q
authors.initials: Q
authors.lastname: Zeng
authors.forename: S
authors.initials: S
authors.lastname: Hirai
authors.forename: P P
authors.initials: PP
authors.lastname: Kong
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: C
authors.initials: C
authors.lastname: Park
authors.forename: S J
authors.initials: SJ
authors.lastname: Yuan
authors.forename: C Q
authors.initials: CQ
authors.lastname: Jin
authors.forename: G
authors.initials: G
authors.lastname: Cao
authors.forename: W L
authors.initials: WL
authors.lastname: Mao
mesh_terms: D007495:Iridium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D044367:Phase Transition; D011312:Pressure; D013059:Spectrum Analysis, Raman; D013324:Strontium / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D007495:Iridium; D013324:Strontium