Abstract
Structural changes in a series of 30% hole-doped perovskites have been studied by powder neutron diffraction. Large local changes, consistent with the freezing of Jahn-Teller distortions of the octahedra, occur at the metal-insulator transition at K in The 4 K structures of four compositions with the same A-cation radius but increasing amounts of A-site disorder, show an increasing radial distortion of the octahedra. The decrease in across this series may reflect these increasing distortions which lower the local strain contribution to the transition enthalpy.
- Received 24 March 1998
DOI:https://doi.org/10.1103/PhysRevB.58.2426
©1998 American Physical Society