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arXiv · 1605.07582

Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7

Yang Ding·Liuxiang Yang·Cheng-Chien Chen·Heung-Sik Kim·Myung Joon Han·Wei Luo·Zhenxing Feng·Mary Upton·Diego Casa·Jungho Kim·Thomas Gog·Zhidan Zeng·Gang Cao·Ho-kwang Mao·Michel van Veenendaal
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Abstract

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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Yang Ding, Liuxiang Yang, Cheng-Chien Chen, Heung-Sik Kim, Myung Joon Han, Wei Luo, Zhenxing Feng, Mary Upton, Diego Casa, Jungho Kim, Thomas Gog, Zhidan Zeng, Gang Cao, Ho-kwang Mao, Michel van Veenendaal. 2016-05-24. Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7. https://doi.org/10.1103/physrevlett.116.216402

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