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

Abstract

The momentum and temperature dependence of the superconducting gap and pseudogap in optimally-doped Bi${}_2$Sr${}_{1.6}$La${}_{0.4}$CuO${}_6$ superconductor is investigated by super-high resolution laser-based angle-resolved photoemission spectroscopy. The measured energy gap in the superconducting state exhibits a standard {\it d}-wave form. Pseudogap opens above T${}_c$ over a large portion of the Fermi surface with a "Fermi arc" formed near the nodal region. In the region outside of the "Fermi arc", the pseudogap has the similar magnitude and momentum dependence as the gap in the superconducting state which changes little with temperature and shows no abrupt change across T${}_c$. These observations indicate that the pseudogap and superconducting gap are closely related and favor the picture that the pseudogap is a precursor to the superconducting gap.

4 pages, 4 figures

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Cited by in corpus (12)

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• From a single-band metal to a high-temperature superconductor via two thermal phase transitions (Supporting Material)
• Pseudogap, Superconducting Gap, and Fermi Arc in High-Tc Cuprates Revealed by Angle-Resolved Photoemission Spectroscopy
• Pseudogap in underdoped cuprates and spin-density-wave fluctuations
• Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates
• Growth, characterization and physical properties of high-quality large single crystals of Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_6$ high-temperature superconductors
• Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ Superconductor
• Prominent Josephson tunneling between twisted single copper oxide planes of Bi${}_2$Sr${}_{2-x}$LaxCuO${}_{6+y}$
• Emergence of Superconductivity from Fully Incoherent Normal State in an Iron-Based Superconductor (Ba${}_{0.6}$K${}_{0.4}$)Fe${}_2$As${}_2$
• Universal phonon softening in the pseudogap state of Tl${}_2$Ba${}_2$Ca${}_{n-1}$Cu${}_n$O${}_{2n+4+\delta }$
• Calculations of Spin Fluctuation Spectral Functions ${\alpha }^{2}F$ in High-Temperature Superconducting Cuprates