Incipient Orbital Order in Half-Metallic Ba{sub 2}FeReO{sub 6}

Journal Article · Fri Jan 05 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.017204· OSTI ID:20861587

Azimonte, C; Granado, E ^[1]; Cezar, J C ^[2]; Huang, Q ^[3]; Lynn, J W ^[3]; Campoy, J C. P. ^[1]; Gopalakrishnan, J ^[4]; Ramesha, K ^[5]

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1. Instituto de Fisica 'Gleb Wataghin', UNICAMP, C.P. 6165, 13083-970, Campinas, Sao Paulo (Brazil)
2. European Synchrotron Radiation Facility, F-38043, Grenoble (France)
3. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
4. Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States)
5. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 (India)

Largely unquenched Re 5d orbital magnetic moments in half-metallic Ba{sub 2}FeReO{sub 6} drive a symmetry lowering transition from a cubic paramagnet to a compressed tetragonal (c/a<1) ferrimagnet below T{sub C}{approx}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.

• OSTI ID: 20861587
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
DEFORMATION
IRON COMPOUNDS
MAGNETIC MOMENTS
MAGNETIZATION
RHENIUM OXIDES
SPIN
SYMMETRY