  The high critical temperature superconductor Lanthanum Barium Copper Oxide
(La2-xBaxCuO4 or LBCO) exhibits a strong anomaly in critical temperature at
1/8th doping, nematicity, and other interesting properties. We report here
Scanning Superconducting Quantum Interference Device (SQUID) imaging of the
magnetic fields and susceptibility in a number of thin film LBCO samples with
doping in the vicinity of the 1/8th anomaly. Spatially resolved measurements of
the critical temperatures of these samples do not show a pronounced depression
at 1/8th doping. They do, however, exhibit strong, nearly linear modulations of
the susceptibility ("straie") of multiple samples with surprisingly long
periods of 1-4 microns. Counterintuitively, vortices trap in positions of
largest diamagnetic susceptibility in these striae. Given the rich interplay of
different orders in this material system and its known sensitivity to epitaxial
strain, we propose phase separation as a possible origin of these features and
discuss scenarios in which that might arise.
