Universal doping dependence of the ground state staggered magnetization in cuprates

TL;DR

This study investigates how the antiferromagnetic order parameter in cuprates depends on doping and lattice structure, revealing a universal behavior independent of specific family variations, with implications for the t-J model.

Contribution

The paper demonstrates that the zero-temperature staggered magnetization in cuprates is independent of family-specific parameters, highlighting a universal doping dependence.

Findings

M0(x,Dp_m) is x-independent across families

Lattice parameters vary with doping and family

Buckling angle changes imply altered hole kinetic energy

Abstract

Using muon spin rotation we determine the zero temperature staggered antiferromagnetic order parameter M0 versus hole doping measured from optimum Dp_m, in the (Ca_{x}La_{1-x})(Ba_{1.75-x}La_{0.25+x})Cu_{3}O_{y} system. In this system the maximum Tc and the superexchange J vary by 30% between families (x). M0(x,Dp_m) is found to be x-independent. Using neutron diffraction we also determine the lattice parameters variations for all x and doping. The oxygen buckling angle is found to change with x, implying a change in the holes kinetic energy. We discuss the surprising insensitivity of M0(x,Dp_m) to the kinetic energy variations in the framework of the t-J model.