title: Magneto-elastic phase transitions in one-dimensional systems.
abstract: The magneto-elastic phase diagram in one-dimensional systems relating to the interplay between magnetism and lattice distortion is studied in a double-exchange and super-exchange model considering classical localized spins and the limit of large Hund's coupling. At low super-exchange interaction energy, a phase transition occurs between electron-full ferromagnetic distorted and electron-empty antiferromagnetic undistorted phases via phase separation. In this case, all electrons and lattice distortions are found within the ferromagnetic domain. For higher super-exchange interaction energy, phase separations consisting of two- or three-site distorted independent magnetic polarons separated by electron-empty undistorted antiferromagnetic links are obtained. In this regime, each polaron contains an electron, leading to a Wigner crystallization. The lattice distortion and charge distribution inside the polarons are also calculated.
authors.affiliation: Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, 04510 México DF, Mexico.
authors.forename: J R
authors.initials: JR
authors.lastname: Suárez
authors.forename: E
authors.initials: E
authors.lastname: Vallejo
authors.forename: O
authors.initials: O
authors.lastname: Navarro
authors.forename: M
authors.initials: M
authors.lastname: Avignon