The magnetically ordered phase of body-centered tetragonal UAu2Si2 was explored through 29Si-NMR experiments. The field-swept NMR spectra show asymmetric peak splitting below magnetic phase transition temperature, Tm = 20 K. This splitting is well explained by the occurrence of a magnetic order with propagation vector of q = (2/3, 0, 0) and magnetic moments pointing parallel to the tetragonal [001] axis, offering evidence for uncompensated "up-up-down"-type antiferromagnetic ordering with a spontaneous [001] magnetization component. A symmetry analysis of the hyperfine-coupling tensor with phenomenological corrections including orbital and dipolar-field contributions yields the magnitude of the ordered moment to be approximately 1.4 ± 0.2 Bohr magneton per uranium ion, and evaluates the site-dependent hyperfine-coupling constants.
@article{arxiv.1712.03469,
title = {Uncompensated Antiferromagnetic Ordering of UAu$_2$Si$_2$ Studied by $^{29}$Si-NMR},
author = {C. Tabata and Y. Ihara and S. Shimmura and N. Miura and H. Hidaka and T. Yanagisawa and H. Amitsuka},
journal= {arXiv preprint arXiv:1712.03469},
year = {2018}
}