Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba2 CoGe 2 O 7

V. Hutanu, A. P. Sazonov, M. Meven, G. Roth, A. Gukasov, H. Murakawa, Y. Tokura, D. Szaller, S. Bordács, I. Kézsmárki, V. K. Guduru, L. C J M Peters, U. Zeitler, J. Romhányi, B. Náfrádi

Research output: Contribution to journalArticle

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Abstract

We report on spherical neutron polarimetry and unpolarized neutron diffraction in zero magnetic field as well as flipping ratio and static magnetization measurements in high magnetic fields on the multiferroic square lattice antiferromagnet Ba2CoGe2O7. We found that in zero magnetic field the magnetic space group is Cm′m2′ with sublattice magnetization parallel to the [100] axis of this orthorhombic setting. The spin canting has been found to be smaller than 0.2 in the ground state. This assignment is in agreement with the field-induced changes of the magnetic domain structure below 40 mT as resolved by spherical neutron polarimetry. The magnitude of the ordered moment has been precisely determined. Above the magnetic ordering temperature short-range magnetic fluctuations are observed. Based on the high-field magnetization data, we refined the parameters of the recently proposed microscopic spin model describing the multiferroic phase of Ba2CoGe2O7.

Original languageEnglish
Article number064403
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number6
DOIs
Publication statusPublished - Feb 6 2014

Fingerprint

Antiferromagnetism
antiferromagnetism
Magnetization
Temperature distribution
temperature distribution
polarimetry
Magnetic fields
magnetization
Polarimeters
magnetic fields
neutrons
Neutrons
magnetic domains
Magnetic domains
sublattices
neutron diffraction
Neutron diffraction
Ground state
moments
ground state

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba2 CoGe 2 O 7. / Hutanu, V.; Sazonov, A. P.; Meven, M.; Roth, G.; Gukasov, A.; Murakawa, H.; Tokura, Y.; Szaller, D.; Bordács, S.; Kézsmárki, I.; Guduru, V. K.; Peters, L. C J M; Zeitler, U.; Romhányi, J.; Náfrádi, B.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 6, 064403, 06.02.2014.

Research output: Contribution to journalArticle

Hutanu, V, Sazonov, AP, Meven, M, Roth, G, Gukasov, A, Murakawa, H, Tokura, Y, Szaller, D, Bordács, S, Kézsmárki, I, Guduru, VK, Peters, LCJM, Zeitler, U, Romhányi, J & Náfrádi, B 2014, 'Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba2 CoGe 2 O 7', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 6, 064403. https://doi.org/10.1103/PhysRevB.89.064403
Hutanu, V. ; Sazonov, A. P. ; Meven, M. ; Roth, G. ; Gukasov, A. ; Murakawa, H. ; Tokura, Y. ; Szaller, D. ; Bordács, S. ; Kézsmárki, I. ; Guduru, V. K. ; Peters, L. C J M ; Zeitler, U. ; Romhányi, J. ; Náfrádi, B. / Evolution of two-dimensional antiferromagnetism with temperature and magnetic field in multiferroic Ba2 CoGe 2 O 7. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 6.
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