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  Hour-glass magnetic spectrum in a stripeless insulating transition metal oxide

Drees, Y., Lamago, D., Piovano, A., & Komarek, A. C. (2013). Hour-glass magnetic spectrum in a stripeless insulating transition metal oxide. Nature Communications, 4: 2449, pp. 2449-1-2449-11. doi:10.1038/ncomms3449.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1E5C-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-952A-C
Genre: Journal Article

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Drees, Y.1, Author              
Lamago, D., Author
Piovano, A., Author
Komarek, A. C.2, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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 Abstract: An hour-glass-shaped magnetic excitation spectrum appears to be a universal characteristic of the high-temperature superconducting cuprates. Fluctuating charge stripes or alternative band structure approaches are able to explain the origin of these spectra. Recently, an hourglass spectrum has been observed in an insulating cobaltate, thus favouring the charge stripe scenario. Here we show that neither charge stripes nor band structure effects are responsible for the hour-glass dispersion in a cobaltate within the checkerboard charge-ordered regime of La2-xSrxCoO4. The search for charge stripe ordering reflections yields no evidence for charge stripes in La1.6Sr0.4CoO4, which is supported by our phonon studies. With the observation of an hour-glass-shaped excitation spectrum in this stripeless insulating cobaltate, we provide experimental evidence that the hour-glass spectrum is neither necessarily connected to charge stripes nor to band structure effects, but instead, probably intimately coupled to frustration and arising chiral or non-collinear magnetic correlations.

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Language(s): eng - English
 Dates: 2013-09-12
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: eDoc: 670757
ISI: 000325533700046
DOI: 10.1038/ncomms3449
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Title: Nature Communications
Source Genre: Journal
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Pages: - Volume / Issue: 4 Sequence Number: 2449 Start / End Page: 2449-1 - 2449-11 Identifier: ISSN: 2041-1723