Superfluid response in monolayer high-Tc cuprates

TL;DR

This study investigates how the superfluid density in monolayer high-Tc cuprates varies with doping, revealing rapid increases in underdoped and optimally doped regimes and saturation beyond a critical doping level.

Contribution

It provides the first detailed doping dependence of superfluid density in monolayer high-Tc cuprates using ac-susceptibility and muon spin relaxation techniques.

Findings

Superfluid density increases rapidly with doping in underdoped and optimally doped regimes.

Superfluid density becomes nearly doping independent above p_c = 0.20.

Both HgBa2CuO4+δ and La2-xSrxCuO4 show similar doping dependence patterns.

Abstract

We have studied the doping dependence of the in-plane and out-of-plane superfluid density, \rho^s(0), of two monolayer high-Tc superconductors, HgBa_2CuO_{4+\delta} and La_{2-x}Sr_xCuO_4, using the low frequency ac-susceptibility and the muon spin relaxation techniques. For both superconductors, \rho^s(0) increases rapidly with doping in the under- and optimally doped regime and becomes nearly doping independent above a critical doping, p_c = 0.20.