First-order density-wave-like transitions in surface-doped Na2IrO3

Article

关键词: MAGNETIC-FIELD DEPENDENCE;    INSULATOR TRANSITIONS;    MOTT-INSULATOR;    PHASE;    METAL;    SUPERCONDUCTORS;    TRANSPORT;    SR2IRO4;    NBSE3;   

DOI  :  10.1103/PhysRevB.94.041109

来源: SCIE

【 摘 要 】

We demonstrate that the surface of the honeycomb lattice iridate Na2IrO3 is extremely tunable by plasma etching. We have succeeded in turning the surface of Na2IrO3 metallic by argon plasma etching which leads to the removal of Na from the surface. The surface structure does not change in this process as revealed by grazing incidence small-angle x-ray scattering. The sheet resistance R-s can be reduced by several orders of magnitude by varying the etching duration. Temperature-dependent R-s (T) for the metallic samples shows signatures of spinor charge-density-wave transitions with abrupt changes in R-s. Thermal hysteresis between cooling and warming measurements across the transition indicates a first-order transition. For the most metallic sample R-s (T) data at low temperatures follow a T-2 behavior suggesting normal Fermi-liquid behavior.

【 授权许可】

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