Nanoscale phase separation in deeply underdoped Bi2Sr2CuO6+delta and Ca2CuO2Cl2

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTOR;    CHARGE-STRIPE ORDER;    COMPETITION;    LA2CUO4+DELTA;    TRANSITION;    CRYSTAL;    METAL;    GAP;   

DOI  :  10.1103/PhysRevB.91.140501

来源: SCIE

【 摘 要 】

We demonstrate that the tunneling spectra from deeply underdoped Bi2Sr2CuO6+delta (Bi2201) and Ca2CuO2Cl2 (CCOC) provide clear evidence for a nanoscale phase separation (NPS), which causes the gap to fill rather than close with doping. The phase separation extends from half-filling to a doping of x similar to 0.09. Assuming that the NPS is in the form of stripes, the nodal gap, which we model as a Coulomb gap, arises from impurity pinning of the charged stripes, and ultimately drives a metal-insulator transition.

【 授权许可】

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