Evidence for two electronic components in high-temperature superconductivity from NMR

TL;DR

This paper presents NMR data analysis on La1.85Sr0.15CuO4, supporting a two-component model of high-temperature superconductivity, contrasting with the traditional one-component view, and provides detailed temperature-dependent susceptibilities.

Contribution

It introduces a novel analysis of NMR shift data revealing two electronic components in cuprates, challenging the conventional single-component paradigm.

Findings

Identification of two independent susceptibilities above Tc

First determination of temperature dependence of all three susceptibilities

Results align with recent theoretical models by Barzykin and Pines

Abstract

A new analysis of 63Cu and 17O NMR shift data on La1.85Sr0.15CuO4 is reported that supports earlier work arguing for a two-component description of this material, but conflicts with the widely held view that the cuprates are a one-component system. The data are analyzed in terms of two components A and B with susceptibilities Chi(A), Chi(B), and Chi(AB)=Chi(BA) . We find that above Tc, Chi(AB) and Chi(BB) are independent of temperature and obtain for the first time the temperature dependence of all three susceptibilities above Tc as well as the complete temperature dependence of Chi(AA)+Chi(AB) and of Chi(AB)+Chi(BB) below Tc. The form of the results agrees with that recently proposed by Barzykin and Pines.