BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors

Abstract

Although cuprate superconductors have been intensively studied for the past decades, there is no consensus regarding the microscopic origin of their superconductivity. In this work, we measure the low-energy electrodynamic response of slightly underdoped and overdoped La${}_{2-x}$Ce${}_x$CuO${}_4$ thin films using time-domain terahertz (THz) spectroscopy to determine the temperature and field dependence of the superfluid spectral weight. We show that the temperature dependence obeys the relation \textit{n${}_s$} $\propto$ $1-(T/T_c{)}^2$, typical for dirty limit BCS-like $d$-wave superconductors. Furthermore, the magnetic field dependence was found to follow a sublinear $\sqrt{B}$ form, which supports predictions based on a $d$-wave symmetry for the superconducting gap. These observations imply that the superconducting order in these electron-doped cuprates can be well described in terms of a disordered BCS $d$-wave formalism.

arXiv comment6 pages, 5 figures

References in corpus (20)

• Progress and perspectives on the electron-doped cuprates
• Nonlinear Meissner Effect in CuO Superconductors
• d-Wave Model for Microwave Response of High-Tc Superconductors
• Evidence for nodal quasiparticles in electron-doped cuprates from penetration depth measurements
• Evidence for a Transition in the Pairing Symmetry of the Electron-Doped Cuprates La_{2-x}Ce_xCuO_{4-y} and Pr_{2-x}Ce_xCuO_{4-y}
• Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
• Locating the missing superconducting electrons in overdoped cuprates
• Disorder and superfluid density in overdoped cuprate superconductors
• Infrared conductivity of a d_{x^2-y^2}-wave superconductor with impurity and spin-fluctuation scattering
• Magnetic Penetration Depth Measurements of Pr${}_{2-x}$Ce${}_x$CuO${}_{4-\delta }$ Films on Buffered Substrates: Evidence for a Nodeless Gap
• Superfluid response in electron-doped cuprate superconductors
• Optical conductivity of overdoped cuprate superconductors: application to LSCO
• From Mott to not: phenomenology of overdoped cuprates
• Fermi Surface reconstruction and anomalous low temperature resistivity in electron-doped La2-xCexCuO4
• Selective formation of apical oxygen vacancies in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Anomalous normal state resistivity in superconducting $L{a}_{2-x}C{e}_{x}Cu{O}_4$: Fermi liquid or strange metal?
• Nernst effect in the electron-doped cuprate superconductor La2-xCexCuO4
• On the peak in the far-infrared conductivity of strongly anisotropic cuprates
• Doping dependence of the gap anisotropy in LCCO studied by millimeter-wave spectroscopy
• Submillimeter spectroscopy of tilted Nd_{1.85}Ce_{0.15}CuO_{4-δ} films: observation of a mixed a-c excitation

Cited by in corpus (6)

• Low-energy electrodynamics of infinite-layer nickelates: evidence for d-wave superconductivity in the dirty limit
• Current-enabled optical conductivity of superconductors
• Evolution of the cyclotron mass with doping in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Optical absorption in tilted geometries as an indirect measurement of longitudinal plasma waves in layered cuprates
• Signatures of three-dimensional photo-induced superconductivity in YBa${}_2$Cu${}_3$O${}_{6.48}$
• Re-entrant unconventional superconductivity induced by rare-earth substitution in Nd1-xEuxNiO2 thin films