Nuclear Spin-Lattice Relaxation in the Layered Compounds MS₂ and MS₂(PYRIDINE)_1⁄2; M=Ta and Nb

Abstract

Measurements of the ¹⁸¹Ta and ⁹³Nb spin-lattice relaxation time T₁ at low temperatures are reported for the 2H polytypes of TaS₂ and NbS₂ and their pyridine intercalation compounds. An analysis of T₁T shows that, on the intercalation of pyridine molecules, the density of states at Fermi level N(E_F) increases about 30% for 2H-TaS₂, while decreases about 30% for 2H-NbS₂. This is suggestive of charge transfer from pyridine molecules to d_z² conduction band of the disulfides.