Double-k phase of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7

S. Mühlbauer; S. N. Gvasaliya; E. Pomjakushina; A. Zheludev

doi:10.1103/PhysRevB.84.180406

Double-k phase of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7

Strongly Correlated Electrons 2015-05-30 v1

Authors: S. Mühlbauer , S. N. Gvasaliya , E. Pomjakushina , A. Zheludev

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Abstract

Neutron diffraction is used to re-investigate the magnetic phase diagram of the noncentrosymmetric tetragonal antiferromagnet Ba2CuGe2O7. A novel incommensurate double-k magnetic phase is detected near the commensurate-incommensurate phase transition. This phase is stable only for magnetic field closely aligned with the 4-fold symmetry axis. The results emphasize the inadequacy of existing theoretical models for this unique material, and points to additional terms in the Hamiltonian or lattice effects.

Keywords

dzyaloshinskii-moriya interaction helimagnet double-k magnetic phase neutron diffraction commensurate-incommensurate phase transition barium copper germanate

Cite

@article{arxiv.1108.0432,
  title  = {Double-k phase of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7},
  author = {S. Mühlbauer and S. N. Gvasaliya and E. Pomjakushina and A. Zheludev},
  journal= {arXiv preprint arXiv:1108.0432},
  year   = {2015}
}

Comments

4 pages, 5 figures

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