Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2 O7

Academic Article

Abstract

  • © 2016 American Physical Society. The spin-orbit Mott insulator Sr3Ir2O7 provides a fascinating playground to explore insulator-metal transition driven by intertwined charge, spin, and lattice degrees of freedom. Here, we report high-pressure electric resistance and resonant inelastic x-ray scattering measurements on single-crystal Sr3Ir2O7 up to 63-65 GPa at 300 K. The material becomes a confined metal at 59.5 GPa, showing metallicity in the ab plane but an insulating behavior along the c axis. Such an unusual phenomenon resembles the strange metal phase in cuprate superconductors. Since there is no sign of the collapse of spin-orbit or Coulomb interactions in x-ray measurements, this novel insulator-metal transition is potentially driven by a first-order structural change at nearby pressures. Our discovery points to a new approach for synthesizing functional materials.
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    Author List

  • Ding Y; Yang L; Chen CC; Kim HS; Han MJ; Luo W; Feng Z; Upton M; Casa D; Kim J
  • Volume

  • 116
  • Issue

  • 21