Magnetic ordering in electronically phase separated Sr/O co-doped La(2-x)Sr(x)CuO(4+y)

TL;DR

This study investigates magnetic order in co-doped La(2-x)Sr(x)CuO(4+y), revealing long-range incommensurate antiferromagnetic order at the superconducting transition, with unique field independence compared to non-superoxygenated variants.

Contribution

It provides new insights into magnetic ordering in super-oxygenated LSCO+O, showing fully developed magnetic order at the superconducting transition without field dependence.

Findings

Long-range incommensurate antiferromagnetic order below T_c

Magnetic order parameter is field-independent in LSCO+O

Magnetic order coincides with superconducting transition at 40 K

Abstract

We present results of magnetic neutron diffraction experiments on the co-doped super-oxygenated La(2-x)Sr(x)CuO(4+y) (LSCO+O) system with x=0.09. The spin-density wave has been studied and we find long-range incommensurate antiferromagnetic order below T_N coinciding with the superconducting ordering temperature T_c=40 K. The incommensurability value is consistent with a hole-doping of n_h~1/8, but in contrast to non-superoxygenated La(2-x)Sr(x)CuO(4) with hole-doping close to n_h ~ 1/8 the magnetic order parameter is not field-dependent. We attribute this to the magnetic order being fully developed in LSCO+O as in the other striped lanthanum-cuprate systems.