Interplay between quantum criticality and geometric frustration in Fe 3Mo3N with stella quadrangula lattice

T. Waki*, S. Terazawa, Teruo Yamazaki, Y. Tabata, K. Sato, A. Kondo, K. Kindo, M. Yokoyama, Y. Takahashi, H. Nakamura

*この研究の対応する著者

研究成果: Article査読

12 被引用数 (Scopus)

抄録

We propose the η-carbide-type correlated-electron metal Fe 3Mo3N as a new candidate for testing geometric frustration in itinerant-electron magnets. In this compound, ferromagnetism is abruptly induced from a non-magnetic 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 correlation hidden in the magnetic measurements. It causes a new type of geometric frustration in the stella quadrangula (SQ) lattice of the Fe sublattice, which is a corner-shared lattice of two nested regular tetrahedrons. Although the SQ lattice is one of pyrochlore-derived lattices, we anticipate the unique nature of the frustration due to the competition between first- and second-neighbour interactions, J1 and J2, possibly of direct exchange type. We propose that the frustrated antiferromagnetic correlation suppresses the ferromagnetic correlation to its marginal point and is therefore responsible for the origin of the ferromagnetic quantum critical behaviour in pure Fe3Mo3N.

本文言語English
論文番号37004
ジャーナルEPL
94
3
DOI
出版ステータスPublished - 2011 5 1
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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