Jahn-Teller Distortion, Charge Ordering, and Magnetic Transitions in Ca-Doped NdMnO3

S. Y. Wu；S. R. Hwang；W.-H. Li；K. C. Lee；J. W. Lynn；R. S. Liu

Chinese Journal of Physics

38卷2S期（2000 / 04 / 01）

354 - 359

英文

Structural and magnetic properties of (Nd1- x Cax)MnO3, with x = 0, 0.38, and 0.55, have been investigated by means of neutron diffraction and ac magnetic susceptibility measurements. Ca doping induces a structural change to occur at around 250 K, that results in a much fatter unit cell and a significantly shorter axial Mn-O(1) bond length. Both antiferromagnetic and ferromagnetic behaviors were observed. Hole doping shifts the ordering temperature of the Mn spins to a much higher temperature and weakens the antiferromagnetic component as well. Reorientation of the Mn spins were also observed to occur at low temperatures for all three compounds studied.