The 2D-electric-field gradient profile in the incommensurate charge density wave state of 1T-TaS2

Using time differential perturbed angular correlation we probed the incommensurate 2D-plane wave charge density wave in 1T-TaS₂ via the¹⁸¹Ta nuclear quadrupole interaction. For the interpretation of the observed line profiles a non-local treatment of the ICDW-perturbation is required. Taking the tensorial character of the electric field gradient into account the wavelength of the CDW-modulation can be derived from the line profiles within an accuracy of better than 5%.