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  Magnetically induced ferroelectricity in Bi2CuO4

Zhao, L., Guo, H., Schmidt, W., Nemkovski, K., Mostovoy, M., & Komarek, A. C. (2017). Magnetically induced ferroelectricity in Bi2CuO4. Physical Review B, 96(5): 054424, pp. 1-11. doi:10.1103/PhysRevB.96.054424.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-DE4D-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-DE56-D
Genre: Journal Article

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 Creators:
Zhao, L.1, Author              
Guo, H.1, Author              
Schmidt, W.2, Author
Nemkovski, K.2, Author
Mostovoy, M.2, Author
Komarek, A. C.3, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              
3Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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 Abstract: The tetragonal copper oxide Bi2CuO4 has an unusual crystal structure with a three-dimensional network of well separated CuO4 plaquettes. The spin structure of Bi2CuO4 in the magnetically ordered state below T-N similar to 43 K remains controversial. Here we present the results of detailed studies of specific heat, magnetic, and dielectric properties of Bi2CuO4 single crystals grown by the floating zone technique, combined with the polarized neutron scattering and high-resolution x-ray measurements. Down to 3.5 K our polarized neutron scattering measurements reveal ordered magnetic Cu moments which are aligned within the ab plane. Below the onset of the long range antiferromagnetic ordering we observe an electric polarization induced by an applied magnetic field, which indicates inversion symmetry breaking by the ordered state of Cu spins. For the magnetic field applied perpendicular to the tetragonal axis, the spin-induced ferroelectricity is explained in terms of the linear magnetoelectric effect that occurs in a metastable magnetic state. A relatively small electric polarization induced by the field parallel to the tetragonal axis may indicate a more complex magnetic ordering in Bi2CuO4.

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Language(s): eng - English
 Dates: 2017-08-182017-08-18
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 96 (5) Sequence Number: 054424 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008