Effect of a magnetic field on long-range magnetic order in stage-4 and stage-6 superconducting La2CuO(4+y)

TL;DR

This study investigates how an external magnetic field influences the static incommensurate spin-density wave order in superconducting La2CuO(4+y) at different staging levels, revealing long-range order and field-dependent behavior.

Contribution

It demonstrates that both stage-4 and stage-6 La2CuO(4+y) exhibit long-range SDW order and characterizes their field dependence, extending understanding of magnetic order in these materials.

Findings

Stage-6 La2CuO(4+y) forms static long-range SDW order.

Magnetic field enhances SDW order in both stages up to 14.5 T.

Data aligns with a model of competing SDW and superconductivity.

Abstract

We have measured the enhancement of the static incommensurate spin-density wave (SDW) order by an applied magnetic field in stage-4 and stage-6 samples of superconducting La2CuO(4+y). We show that the stage-6 La2CuO(4+y) (Tc=32 K) forms static long-range SDW order with the same wave-vector as that in the previously studied stage-4 material. We have measured the field dependence of the SDW magnetic Bragg peaks in both stage-4 and stage-6 materials at fields up to 14.5 T. A recent model of competing SDW order and superconductivity describes these data well.