Localized electronic states and photoemission superconducting condensate in Bi$_{2}$Sr$_{2}$Ca$_{1}$Cu$_{2}$O$_{8+x}$

TL;DR

This study uses angle-resolved photoemission to reveal two types of carriers contributing to the superconducting condensate in Bi2Sr2Ca1Cu2O8+x, showing both itinerant and localized carriers form Cooper pairs.

Contribution

It provides the first detailed evidence of two distinct carrier types contributing to the superconducting state in this cuprate superconductor.

Findings

Both itinerant and localized carriers contribute to Cooper pairing.

Photoemission data distinguish two carrier types in the superconducting state.

Evidence supports coexistence of different carrier behaviors in high-Tc superconductors.

Abstract

We present the first detailed angle-resolved photoemission evidence that there are two types of carriers that contribute to the photoemission superconducting condensate in $Bi_{2}Sr_{2}Ca_{1}Cu_{2}O_{8+x}$. Our data indicate that both itinerant and somewhat localized normal state carriers can contribute to the formation of Cooper pairs.