Investigation of Precursor Superconducting State in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ through In-plane Optical Spectroscopy

Abstract

A precursor of superconductivity has been searched in the in-plane optical spectra of underdoped YBa${}_2$Cu${}_3$O${}_y$, in which the previous $c$-axis optical spectra showed the presence of superconducting carriers at a temperature far above $T_c$ [Uykur $etal$., Phys. Rev. Lett. 112, 127003 (2014)][Dubroka $etal$., Phys. Rev. Lett. 106, 047006 (2011)]. By carefully subtracting the normal component from the imaginary part of conductivity ${\sigma }_2$($\omega$), we found a clear in-plane response of superconducting condensate at the temperature consistent with the $c$-axis optical data. This confirms that the precursory superconductivity developing with reducing a doping level is an intrinsic phenomenon in the cuprates.

11 pages, 5 figures

References in corpus (7)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Lifshitz critical point in the cuprate superconductor YBa2Cu3Oy from high-field Hall effect measurements
• Competing charge, spin, and superconducting orders in underdoped YBa2Cu3Oy
• Point nodes persisting far beyond Tc in Bi2212
• Sum rules and energy scales in the high-temperature superconductor YBa2Cu3O6+x
• Persistence of superconducting condensate far above the critical temperature in YBa${}_2$(Cu,Zn)${}_3$O${}_y$ revealed by $c$-axis optical conductivity measurements for several Zn concentrations and carrier doping levels
• Coexistence of the Pseudogap and the Superconducting Gap Revealed by the \textit{c}-axis Optical Study of YBa${}_2$(Cu${}_{1-x}$Zn${}_x$)${}_3$O${}_{7-\delta }$

Cited by in corpus (7)

• A theory of coupled dual dynamics of macroscopic phase coherence and microscopic electronic fluids: effect of dephasing on cuprate superconductivity
• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Diamagnetic property and optical absorption in conventional superconductors with magnetic impurities
• Influence of electron irradiation on fluctuation conductivity and pseudogap in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystals
• Influence of strong electron irradiation on fluctuation conductivity and pseudogap in YBa${}_2$Cu${}_3$O${}_7$--$\delta$ single crystals
• Revised phase diagram of the high-$T_c$ cuprate superconductor Pb-doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ revealed by anisotropic transport measurements
• Evolution of the pseudogap and excess conductivity of YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals in the course of long-term aging