In the eta-carbide-type correlated-electron metal Fe3Mo3N, ferromagnetism is abruptly induced from a nonmagnetic non-Fermi-liquid ground state either when a magnetic field (~14 T) applied to it or when it is doped with a slight amount of impurity (~5% Co). We observed a peak in the paramagnetic neutron scattering intensity at finite wave vectors, revealing the presence of the antiferromagnetic (AF) correlation hidden in the magnetic measurements. It causes a new type of geometrical frustration in the stellla quadrangula lattice of the Fe sublattice. We propose that the frustrated AF correlation suppresses the F correlation to its marginal point and is therfore responsible for the origin of the ferromagnetic (F) quantum critical behavior in pure Fe3Mo3N.
@article{arxiv.1007.4599,
title = {Interplay between quantum criticality and geometrical frustration in Fe3Mo3N with stella quadrangula lattice},
author = {Takeshi Waki and Shinsuke Terazawa and Teruo Yamazaki and Yoshikazu Tabta and Keisuke Sato and Akihiro Kondo and Koichi Kindo and Makoto Yokoyama and Yoshinori Takahashi and Hiroyuki Nakamura},
journal= {arXiv preprint arXiv:1007.4599},
year = {2015}
}