Heat capacity signature of frustrated trimerons in magnetite
| Autor: | J. E. Lorenzo, S. Sahling, V. L. Katkov, V. A. Osipov, Gyorgy Remenyi, C. Marin |
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| Přispěvatelé: | Institut fur Festkorperphysics-Dresden, IFP, Technish Universitat Dresden, Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), Instrumentation, Material and Correlated Electrons Physics (IMAPEC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Bogoliubov Laboratory of Theoretical Physics [Dubna] (BLTP), Joint Institute for Nuclear Research (JINR), Magnétisme et Supraconductivité (NEEL - MagSup), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA) |
| Rok vydání: | 2019 |
| Předmět: |
Ferroelectrics and multiferroics
Electronic properties and materials Phonon media_common.quotation_subject Frustration lcsh:Medicine 02 engineering and technology 01 natural sciences Heat capacity Article Charge ordering Condensed Matter::Materials Science 0103 physical sciences Antiferromagnetism 010306 general physics lcsh:Science media_common Physics Multidisciplinary Condensed matter physics Magnon lcsh:R temperature 021001 nanoscience & nanotechnology Ferromagnetism verwey transition [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ferrimagnetic/ferroelastic domain interactions lcsh:Q Condensed Matter::Strongly Correlated Electrons Anomaly (physics) [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el] 0210 nano-technology |
| Zdroj: | Scientific Reports Scientific Reports, Nature Publishing Group, 2020, 10, pp.10909. ⟨10.1038/s41598-020-67955-x⟩ Scientific Reports, 2020, 10, pp.10909. ⟨10.1038/s41598-020-67955-x⟩ Scientific Reports, Vol 10, Iss 1, Pp 1-6 (2020) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-020-67955-x⟩ |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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