Abstract
High-resolution neutron powder diffraction has been applied to determine the structural evolution in the orthorhombic perovskite $R{\text{CrO}}_{3}$ family. The structural distortions observed have been found to be closely related to the dramatic variation in the magnetic ordering temperature ${T}_{\text{N}}$. In addition to the reduction in the orbital overlap integral that can account for the change in ${T}_{\text{N}}$ in the $R{\text{FeO}}_{3}$ family, the effect of $t\text{\ensuremath{-}}e$ hybridization due to the structural distortions are responsible for the dramatic change in ${T}_{\text{N}}$ across the $R{\text{CrO}}_{3}$ family.
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