Multiple bosonic mode coupling in the charge dynamics of the electron-doped superconductor (Pr${}_{2-x}$Ce${}_x$)CuO${}_4$

Abstract

We analyze optical spectroscopy data of the electron-doped superconductor (Pr${}_{2-x}$Ce${}_x$)CuO${}_4$ (PCCO) to investigate the coupling of the charge carriers to bosonic modes. The method of analysis is the inversion of the optical scattering rate ${\tau }_{\mathrm{op}}^{-1}(\omega ,T)$ at different temperatures $T$ by means of maximum entropy technique combined with Eliashberg theory. We find that in the superconducting state the charge carriers couple to two dominant modes one at $\sim 10$meV and a second one at $\sim 45$meV. The low energy mode shows a strong temperature dependence and disappears at or slightly above the critical temperature $T_c$. The high energy mode exists above $T_c$ and moves towards higher energies with increasing temperatures. It also becomes less prominent at temperatures $>100$K above which it evolves into a typical spin-fluctuation background. In contrast to the hole-doped High-$T_c$ superconductors PCCO proves to be a superconductor close to the dirty limit.

10 pages, 8 figures submitted to Physical Review B

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Cited by in corpus (13)

• Progress and perspectives on the electron-doped cuprates
• The Strange Metal State of the Electron-Doped Cuprates
• Intermediate Coupling Model of the Cuprates
• Determination of the optical properties of La{2-x}Ba{x}CuO{4} for several dopings, including the anomalous x=1/8 phase
• Spin Dynamics in Cuprates: Optical Conductivity of HgBa2CuO4
• Optical study of superconducting Pr${}_2$CuO${}_x$ with $x\simeq 4$
• Characteristics of oxygen isotope substitutions in the quasiparticle spectrum of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Anomalous normal state resistivity in superconducting $L{a}_{2-x}C{e}_{x}Cu{O}_4$: Fermi liquid or strange metal?
• Electron-boson spectral density function of correlated multiband systems obtained from optical data: Ba0.6K0.4Fe2As2 and LiFeAs
• Bosonic excitations and electron pairing in an electron-doped cuprate superconductor
• Crossover from inelastic magnetic scattering of Cooper pairs to spin-wave dispersion produces low-energy kink in cuprates
• Eliashberg analysis of the optical conductivity in superconducting Pr${}_2$CuO${}_x$ ($x\simeq 4$)
• Antinodal kink in the band dispersion of electron-doped cuprate ${\mathrm{La}}_{2-x}{\mathrm{Ce}}_x{\mathrm{CuO}}_{4\pm \delta }$