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arXiv · 1010.5834

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

Yu Kawasaki·Jorge L. Gavilano·Lukas Keller·Jurg Schefer·Niels Christensen·Alex Amato·Takashi Ohno·Yutaka Kishimoto·Zhangzhen He·Yutaka Ueda·Mitsuru Itoh
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Abstract

We report a neutron diffraction and muon spin relaxation muSR 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_AF = (0, 0, 1), independent of external magnetic fields for fields below a critical value H_c(T). The ordered moments, of 2.18 μ_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 zig-zags paths) along one of the axis and antiferromagnetically along the other. The temperature dependence of the sub-lattice magnetization is consistent with the expectations of the 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.

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Yu Kawasaki, Jorge L. Gavilano, Lukas Keller, Jurg Schefer, Niels Christensen, Alex Amato, Takashi Ohno, Yutaka Kishimoto, Zhangzhen He, Yutaka Ueda, Mitsuru Itoh. 2010-12-20. Magnetic structure and spin dynamics of quasi-one-dimensional spin-chain antiferromagnet BaCo2V2O8. https://doi.org/10.1103/physrevb.83.064421

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