Direct evidence for charge stripes in a layered cobalt oxide

P. Babkevich (), P. G. Freeman, M. Enderle, D. Prabhakaran and A. T. Boothroyd ()
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P. Babkevich: Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne
P. G. Freeman: Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy, University of Central Lancashire
M. Enderle: Institut Laue-Langevin, CS 20156
D. Prabhakaran: University of Oxford, Clarendon Laboratory
A. T. Boothroyd: University of Oxford, Clarendon Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Recent experiments indicate that static stripe-like charge order is generic to the hole-doped copper oxide superconductors and competes with superconductivity. Here we show that a similar type of charge order is present in La5/3Sr1/3CoO4, an insulating analogue of the copper oxide superconductors containing cobalt in place of copper. The stripe phase we have detected is accompanied by short-range, quasi-one-dimensional, antiferromagnetic order, and provides a natural explanation for the distinctive hourglass shape of the magnetic spectrum previously observed in neutron-scattering measurements of La2−xSrxCoO4 and many hole-doped copper oxide superconductors. The results establish a solid empirical basis for theories of the hourglass spectrum built on short-range, quasi-static, stripe correlations.

Date: 2016
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DOI: 10.1038/ncomms11632

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