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Incipient Orbital Order in Half-Metallic Ba 2 FeReO 6

2007; American Physical Society; Volume: 98; Issue: 1 Linguagem: Inglês

10.1103/physrevlett.98.017204

ISSN

1092-0145

Autores

C. Azimonte, J. C. Cezar, E. Granado, Q. Huang, J. W. Lynn, J.C.P. Campoy, J. Gopalakrishnan, K. Ramesha,

Tópico(s)

Rare-earth and actinide compounds

Resumo

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.

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