Orbital bi-stripes in highly doped bilayer manganites

Journal Article · Mon Aug 01 04:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.064432· OSTI ID:20719316

Beale, T A.W.; Spencer, P D; Hatton, P D; Wilkins, S B; Zimmermann, M von; Brown, S D; Prabhakaran, D; Boothroyd, A T ^[1]

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1. Department of Physics, University of Durham, Rochester Buildings, South Road, Durham, DH1 3LE (United Kingdom)

We present high-resolution high-energy and resonant x-ray-diffraction results from La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} for x=0.55, 0.575, and 0.60. These compounds show superlattice reflections at wave vectors of (h{+-}{delta},k{+-}{delta},l) and (h{+-}2{delta},k{+-}2{delta},l), arising from orbital ordering with associated Jahn-Teller distortions and charge ordering, respectively. We observe a phase transition boundary between the x=0.55 and x=0.575 doping levels. Samples with x=0.55 display structural characteristics similar to those previously reported for x=0.5. Compared to this the long-range order in samples with x=0.55 and x=0.6 have a distinct change in wave-vector and correlation length. We attribute this to a new orbital bi-stripe phase, accompanied by weak, frustrated, charge ordering. The observed azimuthal dependence of the orbital order reflection supports the model proposed for this new phase.

• OSTI ID: 20719316
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 6 Vol. 72; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATIONS
DOPED MATERIALS
JAHN-TELLER EFFECT
LANTHANUM COMPOUNDS
MAGNETORESISTANCE
PHASE TRANSFORMATIONS
REFLECTION
RESOLUTION
STRONTIUM COMPOUNDS
SUPERLATTICES
VECTORS
X-RAY DIFFRACTION