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Title: Interplay between quantum criticality and geometric frustration in Fe
Authors: Waki, T.  kyouindb  KAKEN_id
Terazawa, S.
Yamazaki, T.
Tabata, Y.  kyouindb  KAKEN_id
Sato, K.
Kondo, A.
Kindo, K.
Yokoyama, M.
Takahashi, Y.
Nakamura, H.  kyouindb  KAKEN_id
Author's alias: 和氣, 剛
Issue Date: 3-May-2011
Publisher: IOP Publishing
Journal title: EPL (Europhysics Letters)
Volume: 94
Issue: 3
Thesis number: 37004
Abstract: We propose the η-carbide–type correlated-electron metal Fe3Mo3N 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.
Rights: © IOP Publishing 2011.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/141868
DOI(Published Version): 10.1209/0295-5075/94/37004
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