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Detailed structural measurements were conducted on a new perovskite, ScMnO3,and on orthorhombic LuMnO3. Complementary density functional theory (DFT)calculations were carried out, and predict that ScMnO3 possesses E-phasemagnetic order at low temperature with displacements of the Mn sites (relativeto the high temperature state) of ~0.07 {\AA}, compared to ~ 0.04 {\AA}predicted for LuMnO3. However, detailed local, intermediate and long-rangestructural measurements by x-ray pair distribution function analysis, singlecrystal x-ray diffraction and x-ray absorption spectroscopy, find no local orlong- range distortions on crossing into the low temperature E-phase of themagnetically ordered state. The measurements place upper limits on anystructural changes to be at most one order of magnitude lower than densityfunctional theory predictions and suggest that this theoretical approach doesnot properly account for the spin-lattice coupling in these oxides and maypossibly predict the incorrect magnetic order at low temperatures. The resultssuggest that the electronic contribution to the electrical polarizationdominates and should be properly treated in theoretical models.

Nature of Structural Changes Near the Magnetic Ordering Temperature in Small-Ion Rare Earth Perovskites RMnO3