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  Metamagnetic texture in a polar antiferromagnet

Sokolov, D. A., Kikugawa, N., Helm, T., Borrmann, H., Burkhardt, U., Cubitt, R., et al. (2019). Metamagnetic texture in a polar antiferromagnet. Nature Physics, 15, 671-677. doi:10.1038/s41567-019-0501-0.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-9468-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7A30-D
Genre: Journal Article

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Sokolov, D. A.1, Author              
Kikugawa, N.2, Author
Helm, T.3, Author              
Borrmann, H.4, Author              
Burkhardt, U.5, Author              
Cubitt, R.2, Author
White, J. S.2, Author
Ressouche, E.2, Author
Bleuel, M.2, Author
Kummer, K.2, Author
Mackenzie, A. P.6, Author              
Rößler, U. K.2, Author
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466701              
4Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
5Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
6Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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 Abstract: The notion of a simple ordered state implies homogeneity. If the order is established by a broken symmetry, the elementary Landau theory of phase transitions shows that only one symmetry mode describes this state. At the exact points of phase coexistence, domain states composed of large regions of different phases can be stabilized by long-range interactions. In uniaxial antiferromagnets, so-called metamagnetism is an example of such behaviour where antiferromagnetic and field-induced, spin-polarized paramagnetic/ferromagnetic states coexist at a jump-like transition in the magnetic phase diagram. Here, by combining experiments with theoretical analysis, we show that a different type of mixed state between antiferromagnetism and ferromagnetism can be created in certain non-centrosymmetric materials. In small-angle neutron scattering experiments, we observe a field-driven spin state in the layered antiferromagnet Ca3Ru2O7, which is modulated on a scale between 8 and 20 nm and has both antiferromagnetic and ferromagnetic parts. We call this state a metamagnetic texture and attribute its appearance to the chiral twisting effects of the asymmetric Dzyaloshinskii–Moriya exchange. The observation can be understood as an extraordinary coexistence—in one thermodynamic state—of spin orders that belong to different symmetries. The complex nature of this metamagnetic state is demonstrated experimentally by measurements of anomalies in electronic transport that reflect the spin polarization in the metamagnetic texture; determination of the magnetic orbital moments, which support the existence of strong spin–orbit effects, is a pre-requisite for the mechanism of twisted magnetic states in this material. Our findings provide an example of a rich and largely unexplored class of textured states. Such textures mediate between different ordering modes near phase coexistence, and produce extremely rich phase diagrams.

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Language(s): eng - English
 Dates: 2019-04-292019-04-29
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1038/s41567-019-0501-0
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 15 Sequence Number: - Start / End Page: 671 - 677 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850