The spin dynamics of electron doped Mott insulators on a triangular lattice is studied based on the t−J model. It is found that the particularly universal behaviors of integrated dynamical spin structure factor seen in the doped Mott insulators on a square lattice, are absent in the doped Mott insulators on a triangular lattice, indicating the presence of the normal state gap. As a result, the spin-lattice relaxation rate 1/T1 divided by T reduces with decreasing temperatures in the temperature region above 0.2J≈50K, then follows a Curie-Weiss-like behavior at the temperature less than 50K, in qualitative agreement with experimental observations.
@article{arxiv.1212.5371,
title = {Dynamical spin response of electron doped Mott insulators on a triangular lattice},
author = {Bin Liu and Ying Liang},
journal= {arXiv preprint arXiv:1212.5371},
year = {2015}
}