Muon spin relaxation and electron/neutron diffraction studies of BaTi2(As1−xSbx)2O: Absence of static magnetism and superlattice reflections

We present the results of muon spin relaxation/rotation, transmission electron microscopy, and neutron diffraction measurements performed on several specimens of BaTi2(As1−xSbx)2O, which is known to have either charge density or spin density wave ordering at TDW for all x, and superconductivity below Tc ≈ 1 K for x = 1. Zero-field muon spin relaxation measurements show no significant increase in relaxation rate at the density wave ordering …