Double-k phase of the Dzyaloshinskii-Moriya helimagnet Ba{sub 2}CuGe{sub 2}O{sub 7}

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.84.180406· OSTI ID:21596914

Muehlbauer, S; Gvasaliya, S N; Zheludev, A ^[1]; Pomjakushina, E ^[2]

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1. Neutron Scattering and Magnetism Group, Laboratory for Solid State Physics, ETH Zuerich, Zuerich (Switzerland)
2. Laboratory for Developments and Methods (LDM), Paul Scherrer Institut, Villigen (Switzerland)

Neutron diffraction is used to reinvestigate the magnetic phase diagram of the noncentrosymmetric tetragonal antiferromagnet Ba{sub 2}CuGe{sub 2}O{sub 7}. An incommensurate double-k magnetic phase is detected near the commensurate-incommensurate phase transition. This phase is stable only for field closely aligned with the fourfold 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.

• OSTI ID: 21596914
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 84, Issue 18; Other Information: DOI: 10.1103/PhysRevB.84.180406; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
BARIUM COMPOUNDS
COPPER COMPOUNDS
GERMANIUM COMPOUNDS
HAMILTONIANS
MAGNETS
NEUTRON DIFFRACTION
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SYMMETRY
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
DIAGRAMS
DIFFRACTION
EQUIPMENT
INFORMATION
MATHEMATICAL OPERATORS
QUANTUM OPERATORS
SCATTERING
TRANSITION ELEMENT COMPOUNDS