Magnetic structure investigation of the intercalated transition metal dichalcogenide V_(1/3)NbS_2

摘要

We investigate the temperature evolution of the magnetic structure of V_(1/3)NbS_2 using neutron diffraction techniques. We find that V_(1/3)NbS_2 has two propagation vectors: k_0 = (0,0,0) and k_1 = (0,0,1/3). The k_0 vector can be associated with an antiferromagnetic ordering of in-plane moments with a refined value of 0.90(5)μ_B, and k_1 can be associated with moments along the c axis in an up-down-down configuration with refined values of 1.21(12)μ_B and 0.61 (6)μ_B. Both k_0 and k_1 magnetic components couple with an out-of-plane ferromagnetic moment consistent with magnetization data. Furthermore, single-crystal neutron diffraction shows evidence of diffuse magnetic scattering between the (010) and (01±1/3) Bragg peaks. We also characterize the field and temperature evolution of the magnetic structure in V_(1/3)NbS_2 by magnetic susceptibility and heat capacity measurements. The dc susceptibility measurements give an antiferromagnetic transition temperature of T_N = 50 K, and the field scans reveal that the moment does not saturate at magnetic fields up to 100 kOe.