Interplay between quantum criticality and geometrical frustration in Fe3Mo3N with stella quadrangula lattice
Takeshi Waki, Shinsuke Terazawa, Teruo Yamazaki, Yoshikazu Tabta,, Keisuke Sato, Akihiro Kondo, Koichi Kindo, Makoto Yokoyama, Yoshinori, Takahashi, Hiroyuki Nakamura
TL;DR
This paper investigates how quantum criticality and geometrical frustration interact in Fe3Mo3N, revealing that antiferromagnetic correlations in its stellla quadrangula lattice induce ferromagnetic quantum critical behavior.
Contribution
It uncovers the role of geometrical frustration and hidden antiferromagnetic correlations in driving quantum criticality in Fe3Mo3N.
Findings
Presence of antiferromagnetic correlations in Fe3Mo3N
Geometrical frustration in stellla quadrangula lattice
Suppression of F correlation leading to quantum criticality
Abstract
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.
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