Strained structure in Ho0.5Sr0.5MnO3

摘要

The Ho0.5Sr0.5MnO3 perovskite, synthesized in air, has been studied by combining neutron powder and electron diffraction techniques. The Pnma-type structure exhibits a strong tilting of the MnO6 octahedra. This octahedra tilting and microtwinning involve a complex strained structure. No structural transition is observed down to 1.4 K, but short-range A-type antiferromagnetism running over only a few perovskite subcells is evidenced below approximate to 90K. The different behavior of this perovskite compared to other Ln(0.5)Sr(0.5)MnO(3) perovskites is discussed in terms of A-site cationic mismatch. (C) 2002 Elsevier Science (USA). [References: 22]