Study of pseudogap and superconducting quasiparticle dynamics in $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ by time-resolved optical reflectivity

Abstract

The relation between pseudogap (PG) and superconducting (SC) gap, whether PG is a precursor of SC or they coexist or compete, is a long-standing controversy in cuprate high-temperature supercondutors. Here, we report ultrafast time-resolved optical reflectivity investigation of the dynamic densities and relaxations of PG and SC quasiparticles (QPs) in the underdoped $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ ($T_c$ = 82 K) single crystals. We find evidence of two distinct PG components in the positive reflectivity changes in the PG state, characterized by relaxation timescales of ${\tau }_{fast}$ $\approx$ 0.2 ps and ${\tau }_{slow}$ $\approx$ 2 ps with abrupt changes in both amplitudes $A_{fast}$ and $A_{slow}$ at the PG-opening temperature $T^{\ast }$. The former presents no obvious change at $T_c$ and coexists with the SC QP. The latter's amplitude starts decreasing at the SC phase fluctuation $T_p$ and vanishes at $T_c$ followed by a negative amplitude signifying the emergence of the SC QP, therefore suggesting a competition with superconductivity.

arXiv comment5 pages, 4 figures

References in corpus (30)

• Destruction of the Fermi Surface in Underdoped High Tc Superconductors
• Ubiquitous Interplay between Charge Ordering and High-Temperature Superconductivity in Cuprates
• Charge order driven by Fermi-arc instability in Bi2201
• Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
• Distinct Fermi-Momentum Dependent Energy Gaps in Deeply Underdoped Bi2212
• Energy gaps in high-transition temperature cuprate superconductors
• Quasiparticle relaxation dynamics in superconductors with different gap structures: theory and experiments on YBa_{2}Cu_{3}O_{7-δ}
• Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
• The superconducting gap Δ_{c}, the pseudogap Δ_{p} and pair fluctuations above Tc in overdoped YCaBaCuO from femtosecond time-domain spectroscopy
• Single particle and collective excitations in the one-dimensional charge density wave solid K0.3MoO3 probed in real time by femtosecond spectroscopy
• Evidence for two energy scales in the superconducting state of optimally doped (Bi,Pb)2(Sr,La)2CuO6+d
• Protected nodes and the collapse of the Fermi arcs in high Tc cuprates
• Direct spectroscopic evidence for phase competition between the pseudogap and superconductivity in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Ultrafast Dynamics Evidence of High Temperature Superconductivity in Single Unit Cell FeSe on SrTiO3
• The coherent {\it d}-wave superconducting gap in underdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ as studied by angle-resolved photoemission
• Direct observation of the coexistence of pseudogap and superconducting quasi-particles in Bi2212 by time-resolved optical spectroscopy
• Quasiparticle dynamics and gap structure in Hg1223 investigated with femtosecond spectroscopy
• Collapse of superconductivity in cuprates via ultrafast quenching of phase coherence
• A charge density wave-like instability in a doped spin-orbit-assisted weak Mott insulator
• Electron-phonon coupling and charge gap in spin-density-wave iron-pnictides from quasiparticle relaxation dynamics
• Monotonic d-wave Superconducting Gap in Optimally-Doped Bi${}_2$Sr${}_{1.6}$La${}_{0.4}$CuO${}_6$ Superconductor by Laser-Based Angle-Resolved Photoemission Spectroscopy
• Evidence of a photoinduced non-thermal superconducting-to-normal-state phase transition in overdoped Bi${}_2$Sr${}_2$Ca${}_{0.92}$Y${}_{0.08}$Cu${}_2$O${}_{8+\delta }$
• Dynamics of broken symmetry nodal and anti-nodal excitations in Bi_{2} Sr_{2} CaCu_{2} O_{8+δ} probed by polarized femtosecond spectroscopy
• Competition between the Pseudogap and Superconducting States of Bi${}_2$Sr${}_2$Ca${}_{0.92}$Y${}_{0.08}$Cu${}_2$O${}_{8+\delta }$ Single Crystals Revealed by Ultrafast Broadband Optical Reflectivity
• Signatures of superconductivity and pseudogap formation in non-equilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission
• Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La${}_{2-x}$Ce${}_x$CuO${}_{4\pm \delta }$
• Quasiparticle dynamics in overdoped Bi${}_{1.4}$Pb${}_{0.7}$Sr${}_{1.9}$CaCu${}_2$O${}_{8+\delta }$: Coexistence of superconducting gap and pseudogap below $T_c$
• Transient transition from free carrier metallic state to exciton insulating state in GaAs by ultrafast photoexcitation
• Superconducting gap in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ from temperature dependent transient optical reflectivity
• Photoinduced two-step insulator-metal transition in Ti4O7 by ultrafast time-resolved optical reflectivity

Cited by in corpus (4)

• Charge Density Wave order and electron-phonon coupling in ternary superconductor Bi${}_2$Rh${}_3$Se${}_2$
• Ultrafast Optical Spectroscopy Evidence of Pseudogap and Electron-Phonon Coupling in an Iron-Based Superconductor KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Temperature evolution of quasiparticle dispersion dynamics in semimetallic 1T-TiTe2 via high-resolution angle-resolved photoemission spectroscopy and ultrafast optical pump-probe spectroscopy
• Ultrafast charge-transfer dynamics in Ca${}_2$CuO${}_2$Cl${}_2$ from time-resolved optical reflectivity