313 citations · 1.7k across the 53 of their papers we have counts for
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Ab initio investigation of Fe/Fe dimerization and ferroelectricity in multiferroic magnetite: role of electronic correlations
Tetsuya Fukushima, Kunihiko Yamauchi, Silvia Picozzi
Based on ab initio density functional theory, we have investigated a microscopic mechanism that leads to Fe/Fe dimerization and consequent ferroelectricity in…
Interplay between charge-order, ferroelectricity and ferroelasticity: tungsten bronze structures as a playground for multiferroicity
Kunihiko Yamauchi, Silvia Picozzi
Large electron-electron Coulomb-interactions in correlated systems can lead to a periodic arrangement of localized electrons, the so called "charge-order". The latter is here propo…
Exchange bias driven by the Dzyaloshinskii-Moriya interaction and ferroelectric polarization at G-type antiferromagnetic perovskite interfaces
Shuai Dong, Kunihiko Yamauchi, Seiji Yunoki +6
Exchange bias is usually rationalized invoking spin pinning effects caused by uncompensated antiferromagnetic interfaces. However, for compensated antiferromagnets other extrinsic…
Magnetic anisotropy in Li-phosphates and origin of magnetoelectricity in LiNiPO4
Kunihiko Yamauchi, Silvia Picozzi
Li-based phosphates are paradigmatic materials for magnetoelectricity. By means of first-principles calculations, we elucidate the microscopic origin of spin anisotropy and of magn…
Ferroelectricity in multiferroic magnetite Fe3O4 driven by noncentrosymmetric Fe2+/Fe3+ charge-ordering: First-principles study
Kunihiko Yamauchi, Tetsuya Fukushima, Silvia Picozzi
By means of first-principles simulations, we unambiguously show that improper ferroelectricity in magnetite in the low-temperature insulating phase is driven by charge-ordering. An…
Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi2B2C
Yuki Nagai, Nobuhiko Hayashi, Yusuke Kato +2
We investigate the field-angle-dependent zero-energy density of states for YNi2B2C with using realistic Fermi surfaces obtained by band calculations. Both the 17th and 18th bands a…