title: Incipient orbital order in half-metallic Ba2FeReO6.
abstract: Largely unquenched Re 5d orbital magnetic moments in half-metallic Ba2FeReO6 drive a symmetry lowering transition from a cubic paramagnet to a compressed tetragonal (c/a < 1) ferrimagnet below Tc ~ 305 K, with a giant linear magnetoelastic constant and the spins lying spontaneously along the unique tetragonal axis. The large orbital magnetization and degree of structural deformation indicate proximity to a metal-insulator transition. These results point to an incipient orbitally ordered state in the metallic ferrimagnetic phase.
authors.affiliation: Instituto de Física Gleb Wataghin, UNICAMP, CP 6165, 13083-970, Campinas, São Paulo, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Azimonte
authors.forename: J C
authors.initials: JC
authors.lastname: Cezar
authors.forename: E
authors.initials: E
authors.lastname: Granado
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.forename: J C P
authors.initials: JC
authors.lastname: Campoy
authors.forename: J
authors.initials: J
authors.lastname: Gopalakrishnan
authors.forename: K
authors.initials: K
authors.lastname: Ramesha