Method for Measuring the Momentum-Dependent Relative Phase of the Superconducting Gap of High-Temperature Superconductors

TL;DR

This paper introduces a novel, angle-resolved, bulk-sensitive method to measure the phase variation of the superconducting gap on the Fermi surface of high-temperature superconductors, aiding understanding of pairing mechanisms.

Contribution

It proposes a new experimental technique involving phonon linewidth measurements to directly determine the superconducting gap phase variation.

Findings

Method is feasible with current experimental resolution.

Applicable to La_1.85Sr_0.15CuO_4 and Bi_2Sr_2CaCu_2O_8.

Provides constraints on pairing mechanisms.

Abstract

The phase variation of the superconducting gap over the (normal) Fermi surface of the high-temperature superconductors remains a significant unresolved question. Is the phase of the gap constant, does it change sign, or is it perhaps complex? A detailed answer to this question would provide important constraints on various pairing mechanisms. Here we propose a new method for measuring the relative gap PHASE on the Fermi surface which is direct, is angle-resolved, and probes the bulk. The required experiments involve measuring phonon linewidths in the normal and superconducting state, with resolution available in current facilities. We primarily address the La_1.85Sr_.15CuO_4 material, but also propose a more detailed study of a specific phonon in Bi_2Sr_2CaCu_2O_8.