We present a microscopic study of a doped quantum spin liquid candidate, the hyperkagome Na3Ir3O8 compound by using 23Na NMR. We determine the intrinsic behavior of the uniform \textbf{q} =0 susceptibility via shift measurements and the dynamical response by probing the spin-lattice relaxation rate. Throughout the studied temperature range, the susceptibility is consistent with a semimetal behavior, though with electronic bands substantially modified by correlations. Remarkably, the antiferromagnetic fluctuations present in the insulating parent compound Na4Ir3O8 survive in the studied compound. The spin dynamics are consistent with 120o excitations modes displaying short-range correlations.
@article{arxiv.2007.01633,
title = {Magnetic correlations in the semimetallic hyper-kagome iridate Na3Ir3O8},
author = {G. Simutis and T. Takayama and Q. Barthélemy and F. Bert and H. Takagi and P. Mendels},
journal= {arXiv preprint arXiv:2007.01633},
year = {2021}
}