Magnetic transitions in double perovskite Sr{sub 2}FeRe{sub 1-x}Sb{sub x}O{sub 6} (0{<=}x{<=}0.9)

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788059

Jung, Alexandra; Ksenofontov, Vadim; Reiman, Sergey; Therese, Helen Annal; Felser, Claudia; Tremel, Wolfgang ^[1]; Kolb, Ute ^[2]

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1. Institut fuer Anorganische und Analytische Chemie, Johannes Gutenberg-Universitaet Mainz, D-55099 Mainz (Germany)
2. Institut fuer Physikalische Chemie, Johannes Gutenberg-Universitaet Mainz, D-55099 Mainz (Germany)

The double perovskites Sr{sub 2}FeMO{sub 6} (M=Re,Mo) belong to the important class of half-metallic magnetic materials. In this study we explore the effect of replacing the electronic 5d buffer element Re with variable valency by the main group element Sb with fixed valency. X-ray diffraction reveals Sr{sub 2}FeRe{sub 1-x}Sb{sub x}O{sub 6} (0<x<0.9) to crystallize without antisite disorder in the tetragonally distorted perovskite structure (space group I4/mmm). The ferrimagnetic behavior of the parent compound Sr{sub 2}FeReO{sub 6} changes to antiferromagnetic upon Sb substitution as was determined by magnetic susceptibility measurements. Samples up to a doping level of 0.3 are ferrimagnetic, while Sb contents higher than 0.6 result in an overall antiferromagnetic behavior. {sup 57}Fe and {sup 121}Sb Moessbauer spectroscopy specifies the valence state of Sb to be +5 within the whole range of substitution whereas the Fe valence state changes from +2.7 for the parent compound to +2.9 for Sr{sub 2}FeRe{sub 0.1}Sb{sub 0.9}O{sub 6}. Accordingly, Fe adopts the role of an electronic buffer element from Re upon heavy Sb doping. Additionally, {sup 57}Fe Moessbauer results show a coexistence of ferri- and antiferromagnetic clusters within the same perovskite-type crystal structure in the Sb substitution range 0.3<x<0.8, whereas Sr{sub 2}FeReO{sub 6} and Sr{sub 2}FeRe{sub 0.9}Sb{sub 0.1}O{sub 6} are ''purely'' ferrimagnetic and Sr{sub 2}FeRe{sub 0.1}Sb{sub 0.9}O{sub 6} contains antiferromagnetically ordered Fe sites only. Consequently, a replacement of the Re atoms by a nonmagnetic main group element such as Sb blocks the superexchange pathways -Fe-O-Re(Sb)-O-Fe- along the crystallographic axis of the perovskite unit cell and destroys the itinerant magnetism of the parent compound.

• OSTI ID: 20788059
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 14; Other Information: DOI: 10.1103/PhysRevB.73.144414; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
ANTIMONY 121
CONCENTRATION RATIO
FERRIMAGNETIC MATERIALS
IRON 57
IRON COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MOESSBAUER EFFECT
MOLYBDENUM OXIDES
PEROVSKITE
RHENIUM OXIDES
STRONTIUM COMPOUNDS
TETRAGONAL LATTICES
VALENCE
X-RAY DIFFRACTION