The 181Ta Nuclear Quadrupole Interaction in the Charge Density Wave Phases of 1T-TaS2

Abstract

With a high resolution time differential perturbed angular correlation spectrometer we investigated the nuclear quadrupole interaction of 181Ta in 1T-TaS2. The results obtained for the commensurate charge density wave phase lead to a revised assignment of the previously observed 181Ta NQR resonances. Differences in the intra-cluster architecture of the 13-atom Star of David cluster between 1 T-TaS2 and 1 T-TaSe2 could be responsible for the metal to semiconductor transition which occurs in 1T-TaS2 but not in 1T-TaSe2. © 1990, Verlag der Zeitschrift für Naturforschung. All rights reserved.