An energy scale directly related to superconductivity in the high-$T_c$ cuprate superconductors: Universality from the Fermi arc picture

Abstract

We have performed a temperature dependent angle-resolved photoemission spectroscopy (ARPES) study of the tri-layer high-$T_c$ cuprate superconductor (HTSC) Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\hat{I}´}$ (Bi2223), and have shown that the \textquotedblleft effective\textquotedblright superconducting (SC) gap $\hat{I}{”}_{\mathrm{sc}}$ defined at the end point of the Fermi arc and the $T_c$ (= 110 K) approximately satisfies the weak-coupling BCS-relationship 2$\hat{I}{”}_{\mathrm{sc}}$ = 4.3$k_{\mathrm{B}}{T}_c$. Combining this result with previous ARPES results on single- and double-layer cuprates, we show that the relationship between 2$\hat{I}{”}_{\mathrm{sc}}$ = 4.3$k_{\mathrm{B}}{T}_c$ holds for various HTSCs. Furthermore, at $T$ $\sim$ $T_c$, the quasi-patricle width at the end point of the Fermi arc is found to coincide with $\hat{I}{”}_{\mathrm{sc}}$, consistent with the context of Planckian dissipation.

5 pages, 4 figures