Magnetic and Neutron Scattering Study of One-Dimensional Heisenberg Antiferromagnet CsVCl3

Following the magnetic and X-ray crystallographic study on CsVCl 3 by Niel et al. , we performed susceptibility and neutron scattering measurements on the single crystal we prepared. A weak quasi-elastic scattering showing one-dimensional correlation has been found at temperatures lower than room temperature. At temperatures lower than T N =13.3 K, a 3 D order with triangular spin arrangement has been found. Unexpectedly, the (1/3,1/3,1) M magnetic Bragg scattering intensity starts decreasing at about 2 K down to 0.3 K.