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Journal Articles

Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba $_{3}$ CoSb $_{2}$ O $_{9}$

Ito, Saya*; Kurita, Nubuyuki*; Tanaka, Hidekazu*; Kawamura, Seiko; Nakajima, Kenji; Ito, Shinichi*; Kuwahara, Keitaro*; Kakurai, Kazuhisa*

Nature Communications (Internet), 8, p.235_1 - 235_6, 2017/08

https://doi.org/10.1038/s41467-017-00316-x

Times Cited Count：76 Percentile：93.89(Multidisciplinary Sciences)

Journal Articles

Stripe charge ordering in triangular-lattice systems

Onishi, Hiroaki; Hotta, Takashi

AIP Conference Proceedings 850, p.1075 - 1076, 2006/09

https://doi.org/10.1063/1.2355076

We investigate the ground-state property of a $t_{rm 2g}$ -orbital Hubbard model on a triangular lattice at electron density 5.5 by using numerical techniques. There appears several types of paramagnetic phases, but we observe in common that one or two orbitals among three orbitals become relevant due to the effect of orbital ordering. It is found that charge stripe stabilized by the nearest-neighbor Coulomb interaction consists of antiferromagnetic/ferro-orbital chains for small Hund's coupling, while there occurs stripe charge ordering with ferromagnetic/antiferro-orbital chains for large Hund's coupling.

Journal Articles

Magnetic and dielectric properties of frustrated ferrimagnet TmFe $_{2}$ O $_{4}$

Yoshii, Kenji; Ikeda, Naoshi*; Nakamura, Akio

Physica B; Condensed Matter, 378-380, p.585 - 586, 2006/05

https://doi.org/10.1016/j.physb.2006.01.155

Times Cited Count：39 Percentile：80.68(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Ferroelectricity from iron valence ordering in the charge-frustrated system LuFe $_{2}$ O $_{4}$

Ikeda, Naoshi*; Osumi, Hiroyuki*; Owada, Kenji; Ishii, Kenji; Inami, Toshiya; Kakurai, Kazuhisa; Murakami, Yoichi*; Yoshii, Kenji; Mori, Shigeo*; Horibe, Yoichi*; et al.

Nature, 436(7054), p.1136 - 1138, 2005/08

https://doi.org/10.1038/nature04039

Times Cited Count：826 Percentile：99.77(Multidisciplinary Sciences)

By means of resonant X-ray scattering experiments using synchrotron radiation of SPring-8, it was found that a mixed-valence system LuFe $_{2}$ O $_{4}$ is a ferroelectric material owing to a real-space charge-ordering of Fe $^{2+}$ and Fe $^{3+}$ . This ordering is rooted in a charge frustration between the Fe ions on a triangular lattice. The new mechanism of ferroelectricity shown in the present paper offers great potential for designing future ferroelectric devices to be coupled or controlled with the degrees of freedom of electron: charge, spin and orbital.

Journal Articles

Local structure of LiNiO studied by neutron diffraction

Chung, J.-H.*; Proffen, T.*; Shamoto, Shinichi; Ghorayeb, A. M.*; Croguennec, L.*; Tian, W.*; Sales, B. C.*; Jin, R.*; Mandrus, D.*; Egami, Takeshi*

Physical Review B, 71(6), p.064410_1 - 064410_11, 2005/02

https://doi.org/10.1103/PhysRevB.71.064410

Times Cited Count：77 Percentile：90.04(Materials Science, Multidisciplinary)

LiNiO (S=1/2) forms a triangular lattice with the possible magnetic frustration, but the exact state of spin correlation has not yet been known. While there is no signature of long-range Jahn-Teller distortion, local JT distortion has been suspected. We have performed neutron diffraction and atomic pair-density function analyses up to unprecedented large distances to discover a number of unusual features, such as anomalous peak broadening, local JT distortion, sharp oxygen-oxygen distance correlations, and inverted temperature dependence of medium range correlation. These observations are best explained by local orbital ordering of Ni $^{3+}$ ions into three sublattices. This orbital ordering, however, cannot develop into long-range order because of the strain field it generates, and domains of about 10 nm in size are formed. Domains are susceptible to random pinning by impurities ssite disorderd resulting in the loss of structural long-range order. We suggest that this local orbital ordering is the basis for the complex magnetic properties observed in this compound.

Journal Articles