On electron-hole symmetry and phase separation in some electron doped cuprates

TL;DR

This paper analyzes NMR data in electron-doped cuprates, revealing electron-hole symmetry and phase separation effects that influence nuclear spin relaxation, with implications for understanding magnetic fluctuations in these materials.

Contribution

It demonstrates electron-hole symmetry in Sr0.9La0.1CuO2 and links phase separation to nuclear spin relaxation, providing new insights into magnetic behavior in electron-doped cuprates.

Findings

Electron-hole symmetry observed in Sr0.9La0.1CuO2.

Nuclear spin relaxation rate combines constant and temperature-dependent parts.

Temperature dependence matches that of hole-doped YBa2Cu4O8.

Abstract

We conclude from the analysis of the experimental NMR data for electron-doped cuprates that the Coulomb effects caused by doping lead to dynamical spatial phase separation that contributes to the nuclear spin relaxation. Remarkable, the "infinite-layer" Sr0.9La0.1CuO2 reveals unexpected electron-hole symmetry. Its 63^Cu nuclear spin relaxation rate is the sum of a constant and the temperature dependent dissipation components, moreover, the latter turns out to be identical to the 1/63^T_1(T)-behavior in the stoichiometric hole-type compound YBa2Cu4O8. Connection to fluctuations of a magnetic sub-phase is discussed.