Signatures of three-dimensional photo-induced superconductivity in YBa${}_2$Cu${}_3$O${}_{6.48}$

Abstract

Optical excitation of large-amplitude apical oxygen phonon oscillations has been shown to renormalize the electronic properties of YBa${}_2$Cu${}_3$O${}_{6+x}$, inducing a superconducting-like optical response above equilibrium $T_C$. All of the evidence collected so far has been based on the changes of the THz frequency $c$-axis response. In these measurements, the capacitive interlayer coupling was seen to transform into a superconducting-like inductive response. This assignment was strengthened by recent measurements of ultrafast magnetic field expulsion. Here, we report an experimental determination of the transient in-plane optical properties, which has so far been elusive due to the high equilibrium reflectivity and the need to evaluate minute changes in the optical response. We report the appearance of a photo-induced in-plane optical gap $2\Delta \simeq 30$ cm${}^{-1}$ and a divergent imaginary conductivity, both consistent with photo-induced superconductivity. A global fit to these data suggests that in- and out-of-plane electronic properties never completely equilibrate during the dynamics.

42 pages, 19 figures

References in corpus (15)

• Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
• Optically induced superconductivity in striped La2-xBaxCuO4 by polarization-selective excitation in the near infrared
• Coherent Modulation of the YBa2Cu3O6+x Atomic Structure by Displacive Stimulated Ionic Raman Scattering
• Femtosecond x rays link melting of charge-density wave correlations and light-enhanced coherent transport in YBa2Cu3O6.6
• Wavelength dependent optical enhancement of superconducting interlayer coupling in La1.885Ba0.115CuO4
• Parametric resonance of Josephson plasma waves: A theory for optically amplified interlayer superconductivity in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Near-infrared light-induced superconducting-like state in underdoped YBa${}_2$Cu${}_3$O${}_y$ studied by $c$-axis terahertz third-harmonic generation
• Dynamical decoherence of the light induced interlayer coupling in YBa${}_2$Cu${}_3$O${}_{6+\delta }$
• Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K${}_3$C${}_{60}$
• Parametrically amplified phase-incoherent superconductivity in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Model-Independent Sum Rule Analysis Based on Limited-Range Spectral Data
• Squeezed Josephson plasmons in driven YBa${}_2$Cu${}_3$O${}_{6+x}$
• BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors
• Light-Induced Melting of Competing Stripe Orders without Introducing Superconductivity in La${}_{2-\mathbf{x}}$Ba${}_{\mathbf{x}}$CuO${}_4$
• Two-fluid dynamics in driven YBa${}_2$Cu${}_3$O${}_{6.48}$