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Orbital bi-stripes in highly doped bilayer manganites

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

Authors

T.A.W. Beale

P.D. Spencer

P.D. Hatton

S.B. Wilkins

M. von Zimmermann

S.D. Brown

D. Prabhakaran

A.T. Boothroyd



Abstract

We present high-resolution high-energy and resonant x-ray-diffraction results from La2–2xSr1+2xMn2O7 for x=0.55, 0.575, and 0.60. These compounds show superlattice reflections at wave vectors of (h±,k±,l) and (h±2,k±2,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.

Citation

Beale, T., Spencer, P., Hatton, P., Wilkins, S., von Zimmermann, M., Brown, S., …Boothroyd, A. (2005). Orbital bi-stripes in highly doped bilayer manganites. Physical review B, 72, https://doi.org/10.1103/physrevb.72.064432

Journal Article Type Article
Publication Date 2005-08
Deposit Date Apr 28, 2008
Publicly Available Date Apr 28, 2008
Journal Physical Review B
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 72
DOI https://doi.org/10.1103/physrevb.72.064432
Keywords X-Ray-Scattering, Layered manganites, Magnetoresistance, Diffraction, Reflections, Crystal, Order.

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