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Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)

We observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La(2−x)Sr(x)CoO(4) with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitations in this highly hole-doped incommensurate r...

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Autores principales: Li, Z. W., Drees, Y., Kuo, C. Y., Guo, H., Ricci, A., Lamago, D., Sobolev, O., Rütt, U., Gutowski, O., Pi, T. W., Piovano, A., Schmidt, W., Mogare, K., Hu, Z., Tjeng, L. H., Komarek, A. C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846828/
https://www.ncbi.nlm.nih.gov/pubmed/27117928
http://dx.doi.org/10.1038/srep25117
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author Li, Z. W.
Drees, Y.
Kuo, C. Y.
Guo, H.
Ricci, A.
Lamago, D.
Sobolev, O.
Rütt, U.
Gutowski, O.
Pi, T. W.
Piovano, A.
Schmidt, W.
Mogare, K.
Hu, Z.
Tjeng, L. H.
Komarek, A. C.
author_facet Li, Z. W.
Drees, Y.
Kuo, C. Y.
Guo, H.
Ricci, A.
Lamago, D.
Sobolev, O.
Rütt, U.
Gutowski, O.
Pi, T. W.
Piovano, A.
Schmidt, W.
Mogare, K.
Hu, Z.
Tjeng, L. H.
Komarek, A. C.
author_sort Li, Z. W.
collection PubMed
description We observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La(2−x)Sr(x)CoO(4) with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitations in this highly hole-doped incommensurate regime and compare our results with those found in the low-doped incommensurate regime that exhibit hourglass magnetic spectra. The hourglass shape of magnetic excitations completely disappears given a high Sr doping. Moreover, broad low-energy excitations are found, which are not centered at the incommensurate magnetic peak positions but around the quarter-integer values that are typically exhibited by excitations in the checkerboard charge ordered phase. Our findings suggest that the strong inter-site exchange interactions in the undoped islands are critical for the emergence of hourglass spectra in the incommensurate magnetic phases of La(2−x)Sr(x)CoO(4).
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spelling pubmed-48468282016-05-04 Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4) Li, Z. W. Drees, Y. Kuo, C. Y. Guo, H. Ricci, A. Lamago, D. Sobolev, O. Rütt, U. Gutowski, O. Pi, T. W. Piovano, A. Schmidt, W. Mogare, K. Hu, Z. Tjeng, L. H. Komarek, A. C. Sci Rep Article We observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La(2−x)Sr(x)CoO(4) with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitations in this highly hole-doped incommensurate regime and compare our results with those found in the low-doped incommensurate regime that exhibit hourglass magnetic spectra. The hourglass shape of magnetic excitations completely disappears given a high Sr doping. Moreover, broad low-energy excitations are found, which are not centered at the incommensurate magnetic peak positions but around the quarter-integer values that are typically exhibited by excitations in the checkerboard charge ordered phase. Our findings suggest that the strong inter-site exchange interactions in the undoped islands are critical for the emergence of hourglass spectra in the incommensurate magnetic phases of La(2−x)Sr(x)CoO(4). Nature Publishing Group 2016-04-27 /pmc/articles/PMC4846828/ /pubmed/27117928 http://dx.doi.org/10.1038/srep25117 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Li, Z. W.
Drees, Y.
Kuo, C. Y.
Guo, H.
Ricci, A.
Lamago, D.
Sobolev, O.
Rütt, U.
Gutowski, O.
Pi, T. W.
Piovano, A.
Schmidt, W.
Mogare, K.
Hu, Z.
Tjeng, L. H.
Komarek, A. C.
Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)
title Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)
title_full Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)
title_fullStr Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)
title_full_unstemmed Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)
title_short Incommensurate spin correlations in highly oxidized cobaltates La(2−x)Sr(x)CoO(4)
title_sort incommensurate spin correlations in highly oxidized cobaltates la(2−x)sr(x)coo(4)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846828/
https://www.ncbi.nlm.nih.gov/pubmed/27117928
http://dx.doi.org/10.1038/srep25117
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