Determination of the optical properties of La{2-x}Ba{x}CuO{4} for several dopings, including the anomalous x=1/8 phase

Abstract

The optical properties the high-temperature superconductor La{2-x}Ba{x}CuO{4} have been measured over a wide frequency and temperature range for light polarized in the a-b planes and along the c axis. Three different Ba concentrations have been examined, x=0.095 with a critical temperature T_c=32 K, x=0.125 with T_c ~ 2.4 K, and x=0.145 with T_c ~ 24 K. The in-plane behavior of the optical conductivity for these materials at high temperature is described by a Drude-like response with a scattering rate that decreases with temperature. Below T_c in the x=0.095 and 0.145 materials there is a clear signature of the formation of a SC state in the optical properties allowing the strength of the condensate (ρ_{s0}) and the penetration depth to be determined. In the anomalous 1/8 phase, some spectral weight shifts from lower to higher frequency (above 300 cm^{-1}) on cooling below the spin-ordering temperature T_{so} ~ 42 K, associated with the onset of spin-stripe order; we discuss alternative interpretations in terms of a conventional density-wave gap versus the response to pair-density-wave SC. The disappearance of the low-frequency spectral weight at low temperature may indicate the formation of a 2D SC state below the Berezinskii-Kosterlitz-Thouless transition at about 16 K prior to the onset of bulk 3D SC. The two dopings for which a SC response is observed both fall on the universal scaling line ρ_{s0}/8 ~ 4.4 σ_{dc} T_c. The optical properties for light polarized along the c axis reveal an insulating character dominated by lattice vibrations, superimposed on a weak electronic background. In the x=0.095 and 0.145 materials a Josephson plasma edge is observed in the reflectance below T_c. No Josephson plasma edge is observed in the 1/8 phase, suggesting that the presence of charge and spin order frustrates the formation of a supercurrent and bulk 3D SC.

Final revision, 18 pages, 15 figures with 2 tables

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• Melting of Charge Stripes in Vibrationally Driven La1.875Ba0.125CuO4: Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors
• Photo-enhanced metastable c-axis electrodynamics in stripe ordered cuprate La${}_{1.885}$Ba${}_{0.115}$CuO${}_4$
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• Superconductivity, Antiferromagnetism, and Neutron Scattering
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• Evidence for Fluctuating Charge Stripes far above the Charge-Ordering Transition in La${}_{1.67}$ Sr${}_{0.33}$ NiO${}_4$
• Restoring Interlayer Josephson Coupling in La_{1.885}Ba_{0.115}CuO_4 by Charge Transfer Melting of Stripe Order
• Magnetic-Field Tuning of Light-Induced Superconductivity in Striped La${}_{2-x}$Ba${}_x$CuO${}_4$
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• Neutron Scattering Evidence for a Periodically-Modulated Superconducting Phase in the Underdoped Cuprate La${}_{1.905}$Ba${}_{0.095}$CuO${}_4$
• Light-induced new collective modes in La${}_{1.905}$Ba${}_{0.095}$CuO${}_4$ superconductor
• Evolution of superconducting correlations within magnetic-field-decoupled CuO(2) layers of La(1.905)Ba(0.095)CuO(4)
• Superconductivity from charge order in cuprates
• Revealing the frequency-dependent oscillations in the nonlinear terahertz response induced by the Josephson current
• Structure of Charge Density Waves in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$
• Reproduction of Experimental Gap Structure in LiFeAs based on the Orbital-Spin Fluctuation Theory: $s_{++}$-wave, $s_{\pm }$-wave, and hole-$s_{\pm }$-wave states
• Phase diagram and optical conductivity of La1.8-xEu0.2SrxCuO4
• Topological Doping and Superconductivity in Cuprates: An Experimental Perspective
• Light-induced coherent interlayer transport in stripe-ordered ${\mathrm{La}}_{1.6-x}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_x{\mathrm{CuO}}_4$
• How magnetic field can transform a superconductor into a Bose metal
• Light-Induced Melting of Competing Stripe Orders without Introducing Superconductivity in La${}_{2-\mathbf{x}}$Ba${}_{\mathbf{x}}$CuO${}_4$
• Terahertz phase slips in striped La${}_{2-x}$Ba${}_x$CuO${}_4$
• Transport Properties of Stripe-Ordered High Tc Cuprates
• Optical Study of the Stripe-Ordered State
• Superconducting energy gap versus pseudogap in hole-doped cuprates as revealed by infrared spectroscopy
• Simulation of a hump structure in the optical scattering rate within a generalized Allen formalism and its application to copper oxide systems