2003/08/02 by Nilotpal Ghosh, Ghosh, Nilotpal, Suja Elizabeth +9
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0308033
8 figures, Communicated to Journal of Materials Chemistry
arxiv created 2003/08/02 · arxiv updated 2009/12/01
The structure of Nd1-xPbxMnO3 crystals is determined by single crystal X-ray diffraction. Substitution of Pb at the Nd site results in structural phase change from tetragonal (x = 0.25) to cubic (x = 0.37). These changes are attributed to the progressive removal of inter-octahedral tilting and minimization of the octahedral distortion leading to a higher symmetry as doping concentration increases. While the unit cell volume of tetragonal structure (\itP4/mmm) is comparable to that of parent NdMnO3, the volume of cubic unit cell (\itPm3m) is doubled. Electron diffraction patterns support these results and rule out the possibility of twinning. Changes in transport properties as a function of temperature at different doping levels are in accordance with the observed structural changes. It is noticed that \itTc and \itTMI increase with x.