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Compounds having an odd number of electrons with the same orbital characterin occupied and unoccupied band edge states would be expected to have banddegeneracy at the Fermi energy, making such reference system metals. Yet, manyABO3 oxide perovskites with a magnetic 3d B-atom are, in fact, insulators bothbelow and above the Neel temperature. These inconsistencies betweenexperimental observation and expectation have been traditionally resolved byinvoking degeneracy-breaking physics based largely on high-order electroneffects, such as strong interelectronic correlation (the Mott mechanism). Suchexplanations generally utilize the highest symmetry structure, consideringmicroscopic degrees of freedom (m-DOF) as largely passive spectators. Yet, ithas long been known that ABO3 perovskites can manifest an arrangement of m-DOFsin the form of octahedral tilting, bond dimerization, Jahn-Teller distortions,and ordering of local magnetic moments as part of the stabilizing intrinsicsymmetry. Such m-DOFs are seen both by local experimental probes andtheoretically in total energy minimization of its Born-Oppenheimer state. Whilesuch local structural and magnetic symmetry breaking motifs were oftenconsidered to be the reason for gapping of the reference system below thetransition into Para phases, it was also often thought that above thetransition those local motifs might vanish, requiring a different mechanism forgapping - such as strong correlation. Here we examine if such intrinsicstructural and magnetic symmetry breaking might systematically explain theformation of insulating band gaps both below and above the magnetic transitionand account at the same time for specific and non-accidental exceptions of theabsence of gaping in some compounds, such as SrVO3.

Insulating band gaps both below and above the N\'eel temperature in  d-electron LaTiO3, LaVO3, SrMnO3, and LaMnO3 perovskites as a  symmetry-breaking event