Interplay between quantum criticality and geometrical frustration in Fe3Mo3N with stella quadrangula lattice

Details Interplay between quantum criticality and geometrical frustration in Fe3Mo3N with stella quadrangula lattice Interplay between quantum criticality and geometrical frustration in Fe3Mo3N with stella quadrangula lattice

2010-07-27

arxiv.org/abs/1007.4599v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

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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