Magnetic anisotropy and low-energy spin waves in the Dzyaloshinskii-Moriya spiral magnet Ba{sub 2}CuGe{sub 2}O{sub 7}

Journal Article · Sat May 01 04:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.11432· OSTI ID:337546

Zheludev, A; Maslov, S; Shirane, G ^[1]; Tsukada, I; Masuda, T; Uchinokura, K ^[2]; Zaliznyak, I; Erwin, R ^[3]; Regnault, L P ^[4]

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1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
2. Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
3. National Institute of Standards and Technology Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
4. Departement de Recherche Fondamentale sur la Matiere Condensee/Laboratoire de Magnetisme et Diffraction Neutronique, Centre dEtudes Nucleaires de Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex (France)

Neutron-diffraction and inelastic-scattering experiments are used to investigate in detail the field dependence of the magnetic structure and low-energy spin-wave spectrum of the Dzyaloshinskii-Moriya helimagnet Ba{sub 2}CuGe{sub 2}O{sub 7}. The results suggest that the previously proposed model for the magnetism of this compound (an ideal sinusoidal spin spiral, stabilized by isotropic exchange and Dzyaloshinskii-Moriya interactions) needs to be refined. Both recent and previously published data can be quantitatively explained by taking into account the Kaplan-Shekhtman-Entin-Wohlman-Aharony term, a special magnetic anisotropy term that was predicted to always accompany Dzyaloshinskii-Moriya interactions in insulators. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 337546
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER COMPOUNDS
COPPER OXIDES
GERMANIUM OXIDES
INELASTIC SCATTERING
MAGNETIC PROPERTIES
MAGNETS
NEUTRON DIFFRACTION
SPIN WAVES