title: (139)La NMR investigation of quasistatic orbital ordering in La(1-x)Ca(x)MnO(3).
abstract: We report (139)La nuclear magnetic resonance in ferromagnetic and insulating (FMI) La(1-x)Ca(x)MnO(3), 0.10< or =x< or =0.20, which at low temperatures shows the formation of Mn octants with enhanced Mn-O wave function overlapping and electron-spin alignment. The rapid increase of the relaxation rates and the "wipeout" of the (139)La NMR signal intensity on heating, imply a quasistatic character for the Mn octant cells in the FMI phase, which freeze below a transition temperature T(f).
authors.affiliation: Institute of Materials Science, National Center for Scientific Research Demokritos, 153 10 Athens, Greece.
authors.forename: G
authors.initials: G
authors.lastname: Papavassiliou
authors.forename: M
authors.initials: M
authors.lastname: Belesi
authors.forename: M
authors.initials: M
authors.lastname: Fardis
authors.forename: C
authors.initials: C
authors.lastname: Dimitropoulos