Nanoscale phase separation in deep underdoped Bi${}_2$Sr${}_2$CuO${}_{6+\delta }$ and Ca${}_2$CuO${}_2$Cl${}_2$

Abstract

We demonstrate that tunneling spectra in deeply underdoped Bi${}_2$Sr${}_2$CuO${}_{6+\delta }$ (Bi2201) and Ca${}_2$CuO${}_2$Cl${}_2$ (CCOC) provide clear evidence for nanoscale phase separation (NPS), causing the gap to fill with doping rather than close. The phase separation extends over a doping range from half filling to approximately $x\sim 0.09$. Assuming the NPS is in the form of stripes, then the nodal gap -- which we model as a Coulomb gap -- arises from impurity pinning of the charged stripes, ultimately driving a metal-insulator transition.

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Cited by in corpus (5)

• Energy gaps in high-transition temperature cuprate superconductors
• First-Principles Calculation of Spin and Orbital Contributions to Magnetically Ordered Moments in Sr${}_2$IrO${}_4$
• Ab initio description of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ electronic structure
• Interlayer Coupling Induced Quasiparticles
• Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator