Consistent explanations of tunneling and photoemission data in cuprate superconductors: No evidence for magnetic pairing

TL;DR

This study compares tunneling and photoemission data across various cuprate superconductors, providing evidence against magnetic pairing and supporting polaronic/bipolaronic mechanisms, especially in hole-doped Bi2Sr2CaCu2O8.

Contribution

It offers a comprehensive analysis of tunneling and photoemission spectra that challenges magnetic pairing theories in cuprates and supports alternative polaronic mechanisms.

Findings

Magnetic pairing mechanism is ruled out in cuprates.

Supports polaronic/bipolaronic superconductivity in Bi2Sr2CaCu2O8.

Consistent explanations across multiple spectroscopic techniques.

Abstract

We have analyzed scanning tunneling spectra of two electron-doped cuprates Pr0.88LaCe0.12CuO4 (Tc = 21 K and 24 K) and compared them with tunneling spectrum of hole-doped La1.84Sr0.16CuO4 and effective electron-boson spectral function of hole-doped La1.97Sr0.03CuO4 (extracted from angle-resolved photoemission spectrum). We have also analyzed tunneling spectra and angle-resolved photoemission spectra for hole-doped Bi2Sr2CaCu2O8. These results unambiguously rule out magnetic pairing mechanism in both electron- and hole-doped cuprates and support polaronic/bipolaronic superconductivity in hole-doped Bi2Sr2CaCu2O8.