Charge Ordered States in La{sub {ital 1{minus}x}}Sr{sub {ital x}}FeO{sub 3}

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.297· OSTI ID:549696

Li, J Q; Matsui, Y ^[1]; Park, S K; Tokura, Y ^[2]

---

1. National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305 (Japan)
2. Department of Applied Physics, University of Tokyo, Tokyo 113 (Japan)

The presence of complex charge ordering (CO) phenomena in La{sub 1{minus}x}Sr{sub x}FeO{sub 3} (0{le}x{le}0.7) has been revealed by transmission electron microscopy at low temperatures. In La{sub 0.7}Sr{sub 0.3}FeO{sub 3} (x=0.3) the precursory CO reflections become visible as streaks at {approximately}250 K upon cooling. Below 150K these streaks condense to sharp spots at the systemic ((1)/(2),0,0) positions. The real-space images are suggestive of charge segregation occurring at low temperatures. At high doping levels (0.5{le}x{le}0.7) , the CO has been observed in the {l_angle}111{r_angle}{sub {bold p}} direction below {approximately}200 K . In particular, the results obtained La{sub 0.3}Sr{sub 0.7}FeO{sub 3} (x=0.7) can be well understood in terms of CO in sequence {hor_ellipsis}Fe{sup 3+}Fe{sup 3+}Fe {sup 5+}Fe{sup 3+}Fe{sup 3+} Fe{sup 5+}{hor_ellipsis} , as proposed previously. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 549696
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARGE STATES
DOPED MATERIALS
ELECTRON DIFFRACTION
IRON OXIDES
LANTHANUM OXIDES
PEROVSKITES
STRONTIUM OXIDES
STRUCTURAL MODELS
TEMPERATURE RANGE 0065-0273 K
TRANSMISSION ELECTRON MICROSCOPY