Magnetic structure and spin dynamics of the quasi-one-dimensional spin-chain antiferromagnet BaCo2V2O8

Publication: Research - peer-reviewJournal article – Annual report year: 2011

  • Author: Kawasaki, Yu

    Univ Tokushima, Inst Sci & Technol (JP)

  • Author: Gavilano, Jorge L.

    Paul Scherrer Inst, Neutron Scattering Lab (CH)

  • Author: Keller, Lukas

    Paul Scherrer Inst, Neutron Scattering Lab (CH)

  • Author: Schefer, Juerg

    Paul Scherrer Inst, Neutron Scattering Lab (CH)

  • Author: Christensen, Niels Bech

    Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Denmark

  • Author: Amato, Alex

    Swiss Fed Inst Technol, Lab Muon Spin Spect (CH)

  • Author: Ohno, Takashi

    Univ Tokushima, Inst Sci & Technol (JP)

  • Author: Kishimoto, Yutaka

    Univ Tokushima, Inst Sci & Technol (JP)

  • Author: He, Zhangzhen

    Chinese Acad Sci, Fujian Inst Res Struct Matter (CN)

  • Author: Ueda, Yutaka

    Univ Tokyo, Inst Solid State Phys (JP)

  • Author: Itoh, Mitsuru

    Tokyo Inst Technol, Mat & Struct Lab (JP)

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We report a neutron diffraction and muon spin relaxation mu SR study of static and dynamical magnetic properties of BaCo2V2O8, a quasi-one-dimensional spin-chain system. A proposed model for the antiferromagnetic structure includes: a propagation vector (k) over right arrow (AF) = (0,0,1), independent of external magnetic fields for fields below a critical value H-c(T). The ordered moments of 2.18 mu(B) per Co ion are aligned along the crystallographic c axis. Within the screw chains, along the c axis, the moments are arranged antiferromagnetically. In the basal planes the spins are arranged ferromagnetically (forming zigzag paths) along one of the axes and antiferromagnetically along the other. The temperature dependence of the sublattice magnetization is consistent with the expectations of the three-dimensional (3D) Ising model. A similar behavior is observed for the internal static fields at different muon stopping sites. Muon time spectra measured at weak longitudinal fields and temperatures much higher than T-N can be well described using a single muon site with an exponential muon spin relaxation that gradually changes into an stretched exponential on approaching T-N. The temperature-induced changes of the relaxation suggest that the Co fluctuations dramatically slow down and the system becomes less homogeneous as it approaches the antiferromagnetic state.
Original languageEnglish
JournalPhysical Review B (Condensed Matter and Materials Physics)
Publication date2011
Volume83
Issue6
Pages064421
ISSN1098-0121
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 7

Keywords

  • Superconducting materials
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