La$_{2-x}$Ba$_x$CuO$_4$ ($x=\frac{1}{8}$) $\mu$SR data are inconsistent with spin stripe but consistent with spin spiral

TL;DR

This paper analyzes muon spin rotation data for La$_{2-x}$Ba$_x$CuO$_4$ at x=1/8 and finds it incompatible with spin stripe order but consistent with a coplanar spin spiral within the CuO$_2$ plane.

Contribution

It provides a reinterpretation of muSR data, favoring a spin spiral model over the spin stripe model for this compound.

Findings

Muon spin rotation data do not support spin stripe order.

Data are consistent with a coplanar spin spiral in the CuO$_2$ plane.

The static spin expectation value is approximately 0.185.

Abstract

I analyze available $\mu$SR data and show that it is inconsistent with the spin stripe but consistent with the coplanar spin spiral. The plane of the spiral coincides with the CuO$_2$-plane. The static expectation value of the spin is $S=0.37\times\frac{1}{2}$.