Electronic Structure of La2-xSrxCuO4 in the Vicinity of the Superconductor-Insulator Transition

Abstract

We report on the result of angle-resolved photoemission (ARPES) study of La${}_{2-x}$Sr${}_x$CuO${}_4$ (LSCO) from an optimally doped superconductor ($x=0.15$) to an antiferromagnetic insulator ($x=0$). Near the superconductor-insulator transition (SIT) $x\sim 0.05$, spectral weight is transferred with hole doping between two coexisting components, suggesting a microscopic inhomogeneity of the doped-hole distribution. For the underdoped LSCO ($x\le 0.12$), the dispersive band crossing the Fermi level becomes invisible in the $(0,0)-(\pi ,\pi )$ direction unlike Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+y}$. These observations may be reconciled with the evolution of holes in the insulator into fluctuating stripes in the superconductor.

arXiv comment5 pages, 6 EPS figures, use RevTex, to be published in Phys. Rev. B

References in corpus (5)

• Photoemission Evidence for a Remnant Fermi Surface and d-Wave-Like Dispersion in Insulating Ca2CuO2Cl2
• Electronic excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$ : Fermi surface, dispersion, and absence of bilayer splitting
• Fermi Surface and Band Dispersion in La2-xSrxCuO4
• Effect of Stripes on Electronic States in Underdoped La_{2-x}Sr_xCuO_4
• Quantum Transition between an Antiferromagnetic Mott Insulator and $d_{x^2-y^2}$ Superconductor in Two Dimensions

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