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Sr2Ir1−xRhxO4(x<0.5): An inhomogeneousjeff=12Hubbard system
Chikara, Shalinee,Haskel, Daniel,Sim, Jae-Hoon,Kim, Heung-Sik,Chen, Cheng-Chien,Fabbris, G.,Veiga, L. S. I.,Souza-Neto, N. M.,Terzic, J.,Butrouna, K.,Cao, G.,Han, Myung Joon,van Veenendaal, Michel American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.8
Pressure-Induced Confined Metal from the Mott InsulatorSr3Ir2O7
Ding, Yang,Yang, Liuxiang,Chen, Cheng-Chien,Kim, Heung-Sik,Han, Myung Joon,Luo, Wei,Feng, Zhenxing,Upton, Mary,Casa, Diego,Kim, Jungho,Gog, Thomas,Zeng, Zhidan,Cao, Gang,Mao, Ho-kwang,van Veenendaal, American Physical Society 2016 Physical Review Letters Vol.116 No.21
<P>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.</P>