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Heat capacity signature of frustrated trimerons in magnetite
Recently it has been proposed that the long-range electronic order formed by trimerons in magnetite should be frustrated due to the great degeneracy of arrangements linking trimerons. This result has important consequences as charge ordering from the condensed minority band electrons leads to a comp...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7331697/ https://www.ncbi.nlm.nih.gov/pubmed/32616822 http://dx.doi.org/10.1038/s41598-020-67955-x |
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author | Sahling, S. Lorenzo, J. E. Remenyi, G. Marin, C. Katkov, V. L. Osipov, V. A. |
author_facet | Sahling, S. Lorenzo, J. E. Remenyi, G. Marin, C. Katkov, V. L. Osipov, V. A. |
author_sort | Sahling, S. |
collection | PubMed |
description | Recently it has been proposed that the long-range electronic order formed by trimerons in magnetite should be frustrated due to the great degeneracy of arrangements linking trimerons. This result has important consequences as charge ordering from the condensed minority band electrons leads to a complex 3D antiferro orbital order pattern. Further more, the corner sharing tetrahedra structure of spinel B-sites supports frustration for antiferromagnetic alignments. Therefore frustration due to competing interactions will itself induce disorder and very likely frustration in the spin orientations. Here we present very low temperature specific heat data that show two deviations to the magnons and phonons contributions, that we analyze in terms of Schottky-type anomalies. The first one is associated with the thermal activation across both ferroelastic twin and ferromagnetic anti-phase domains. The second Schottky-type anomaly displays an inverse (1/H) field dependence which is a direct indication of the disordered glassy network with macroscopically degenerated singular ground states. |
format | Online Article Text |
id | pubmed-7331697 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-73316972020-07-06 Heat capacity signature of frustrated trimerons in magnetite Sahling, S. Lorenzo, J. E. Remenyi, G. Marin, C. Katkov, V. L. Osipov, V. A. Sci Rep Article Recently it has been proposed that the long-range electronic order formed by trimerons in magnetite should be frustrated due to the great degeneracy of arrangements linking trimerons. This result has important consequences as charge ordering from the condensed minority band electrons leads to a complex 3D antiferro orbital order pattern. Further more, the corner sharing tetrahedra structure of spinel B-sites supports frustration for antiferromagnetic alignments. Therefore frustration due to competing interactions will itself induce disorder and very likely frustration in the spin orientations. Here we present very low temperature specific heat data that show two deviations to the magnons and phonons contributions, that we analyze in terms of Schottky-type anomalies. The first one is associated with the thermal activation across both ferroelastic twin and ferromagnetic anti-phase domains. The second Schottky-type anomaly displays an inverse (1/H) field dependence which is a direct indication of the disordered glassy network with macroscopically degenerated singular ground states. Nature Publishing Group UK 2020-07-02 /pmc/articles/PMC7331697/ /pubmed/32616822 http://dx.doi.org/10.1038/s41598-020-67955-x Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Sahling, S. Lorenzo, J. E. Remenyi, G. Marin, C. Katkov, V. L. Osipov, V. A. Heat capacity signature of frustrated trimerons in magnetite |
title | Heat capacity signature of frustrated trimerons in magnetite |
title_full | Heat capacity signature of frustrated trimerons in magnetite |
title_fullStr | Heat capacity signature of frustrated trimerons in magnetite |
title_full_unstemmed | Heat capacity signature of frustrated trimerons in magnetite |
title_short | Heat capacity signature of frustrated trimerons in magnetite |
title_sort | heat capacity signature of frustrated trimerons in magnetite |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7331697/ https://www.ncbi.nlm.nih.gov/pubmed/32616822 http://dx.doi.org/10.1038/s41598-020-67955-x |
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