Static Spin Correlation in LTT Phase of La${}_{1.875}$Ba${}_{0.075}$Sr${}_{0.05}$CuO${}_4$

We have carried out elastic neutron scattering measurements on La${}_{1.875}$Ba${}_{0.075}$Sr${}_{0.05}$CuO${}_4$ single crystal ($T_c\approx$10K). Incommensurate elastic magnetic peaks were observed in the low-tamperature tetragonal phase with the propergation vector parallel/perpendicular to in-plane Cu-O bond direction. The magnetic peak intensity normalized by the sample volume is approximately six times larger than that of the orthorhombic La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$ at low temperature.