NMR evidence for low-frequency local motion of H (D) atoms in TaV2 at low temperatures

Measurements of the temperature dependence of the 1H, 2D and 51V spin lattice relaxation rates T1-1 in TaV2Hx (Dx) show a second low-temperature T1-1 maximum in addition to the usual maximum associated with H(D) diffusion. This feature can be attributed to low-frequency local motion of H(D) atoms. Strong effects of hydrogen isotope substitution are observed at low temperatures.