Incipient orbital order in half-metallic Ba2FeReO6.
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.
Azimonte
C
C
Instituto de Física Gleb Wataghin, UNICAMP, CP 6165, 13083-970, Campinas, São Paulo, Brazil.
Cezar
J C
JC
Granado
E
E
Huang
Q
Q
Lynn
J W
JW
Campoy
J C P
JC
Gopalakrishnan
J
J
Ramesha
K
K