Novel Insulator to Metal Transition and Superconductivity in Sr-doped La2CuO4

Abstract

We have studied the charge dynamics of Sr-doped La2CuO4 at hole concentration p =0.07. We observed a clear indication of the competition between two new characteristic collective modes of the Wigner lattice orders suggested earlier: one corresponds to a Tc =15 K superconductivity and the other to Tc =30 K. Our results naturally explain the recent observation of metallic transport in extremely low (1%) Sr-doped La2CuO4 and establish a novel insulator to metal transition mechanismand superconductivity in the two-dimensional Wigner lattice ground state. We suggest that the fluctuations of the relative phase between the superconducting condensate and the Wigner lattice order can provide an answer to the unidentified mode in the c-axis conductivity that appears only below Tc.

11 pages, 6 figures

References in corpus (2)

• Mobility of the Doped Holes and the Antiferromagnetic Correlations in Underdoped High-T_c Cuprates
• Wigner Lattice Order, Collective Mode, and Superconductivity in La1.985Sr0.015CuO4+delta System

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• Intrinsic electronic superconducting phases at 60 K and 90 K in double-layer YBa${}_2$Cu${}_3$O${}_{6+\delta }$
• Universal optimal hole-doping concentration in single-layer high-temperature cuprate superconductors
• Charge Ordered RVB States in the Doped Cuprates
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• Robust intrinsic electronic superconducting phases in underdoped La_{2-x}Sr_xCuO4 single crystals
• The "Bohr" Model for the High Tc Superconductivity
• Observation of the predicted charge collective mode of the Tc = 45 K superconducting phase of La2CuO4+δ
• Far-infrared measurements of oxygen-doped polycrystalline La2CuO4.0315 superconductor under slow-cooled and fast-cooled conditions