We report the results of neutron powder diffraction experiments on La 0.15 Ca0.85 MnO3 and Y0.15 Ca 0.85 MnO3. After an incomplete orthorhombic-monoclinic phase transition, the residual orthorhombic phase undergoes an enhancement of Jahn-Teller distortion of MnO6 octahedra. The degree of Jahn-Teller distortion is strongly influenced by coexisting monoclinic phase. Furthermore, ferromagnetism is closely associated with this Jahn-Teller distortion, rather than the buckling effect in the orthorhombic phase. Despite the low concentration of Jahn-Teller active Mn3+ ions, our result indicates an important role of Jahn-Teller effect on physical properties of the lightly electron-doped manganites.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)