Magnetic field induced enhancement of spin-order peak intensity in La(1.875)Ba(0.125)CuO(4)

TL;DR

This study demonstrates that applying a magnetic field along the c axis slightly enhances the spin-order peak intensity in La$_{1.875}$Ba$_{0.125}$CuO$_4$, without affecting low-energy magnetic excitations or peak width.

Contribution

It provides new insights into how magnetic fields influence stripe order and spin correlations in cuprate superconductors.

Findings

Magnetic field causes a small increase in spin-order peak intensity.

No observable change in peak width or low-energy magnetic excitations.

Spin-correlation length is greater along the antiferromagnetic stripes.

Abstract

We report on neutron-scattering results on the impact of a magnetic field on stripe order in the cuprate La$_{1.875}$Ba$_{0.125}$CuO$_4$. It is found that a 7 T magnetic field applied along the {\it c} axis causes a small but finite enhancement of the spin-order peak intensity and has no observable effect on the peak width. Inelastic neutron-scattering measurements indicate that the low-energy magnetic excitations are not affected by the field, within experimental error. In particular, the small energy gap that was recently reported is still present at low temperature in the applied field. In addition, we find that the spin-correlation length along the antiferromagnetic stripes is greater than that perpendicular to them.