Incommensurate Antiferromagnetic Order in the Fe-substituted Bi-2201 Cuprate in the Heavily Overdoped Regime

TL;DR

This study reveals incommensurate antiferromagnetic order in heavily overdoped, Fe-substituted Bi-2201 cuprates, indicating robust magnetic correlations beyond the superconducting phase.

Contribution

First demonstration of incommensurate antiferromagnetic order induced by Fe in heavily overdoped Bi-2201 cuprates, extending understanding of magnetic correlations in cuprates.

Findings

Incommensurate peaks observed in neutron scattering experiments.

Magnetic correlation length similar across overdoped regimes.

Fe substitution stabilizes antiferromagnetic order beyond superconductivity.

Abstract

Elastic neutron scattering experiments showed incommensurate antiferromagnetic peaks in 5% Fe-substituted Bi-2201 cuprate in the non-superconducting heavily overdoped regime. The incommensurability delta~0.21 is comparable to that observed in Fe-substituted Bi-2201 in the overdoped regime. [Hiraka et al., Phys. Rev. B 81, 144501 (2010).] The magnetic correlation length is comparable between the overdoped and non-superconducting heavily overdoped regimes. It is plausible that incommensurate antiferromagnetic order is induced and stabilized by Fe in the heavily overdoped regime, which suggests a robust antiferromagnetic correlation beyond the superconducting dome in the phase diagram.