Microscopic Magnetic Nature of the Quasi-one-Dimensional Antiferromagnet   BaCo2V2O8
  The title compound belongs to a wide group of quasi-one-dimensional (Q1D) antiferromagnets (AF) and its Co2+ ions form Q1D screw-chains along the c-axis. We here present the first investigation of the microscopic magnetic nature of a single crystalline BaCo2V2O8 sample using {\mu}+SR. Our data reveal the presence of several clear muon frequencies below TN indicating the onset of a long-range order. Above 5 K, the {\mu}+SR spectra is well fitted to a simple power-exponential relaxing function. The temperature dependence of the relaxation-rate ({\lambda}) as well as the power (n) display a clear anomaly around T = 44 K, indicating the onset of short-range 1D correlations. 
M. Mansson, K. Prsa, J. Sugiyama, H. Nozaki, A. Amato, K. Omura, S.   Kimura, and M. Hagiwara
cond-mat.str-el