177 citations · 718 across the 21 of their papers we have counts for
22 papers
Vibrational Sample-Based Quantum Diagonalization with Unitary-Cluster-Jastrow Ansätze on IBM QPUs
Kunal Kumar, Erik Lötstedt, Yuri Kobayashi +1
We extend sample-based quantum diagonalization (SQD) to anharmonic vibrational spectra and use it to benchmark how vibrational ansätze scale on present-day hardware under a direct…
Magnetoelastic mapping of the high-field phase diagram in the topological cubic helimagnet SrFeO
Masaki Gen, Shun Okumura, Shusaku Imajo +9
The cubic perovskite SrFeO is a prototypical centrosymmetric itinerant magnet that hosts a quadruple- hedgehog-antihedgehog lattice and exhibits a complex magnet…
Magnetoelectric Control of Toroidal Moment in Ferroaxial Crystal PbMnNiTeO
Shungo Aoyagi, Shunsuke Kitou, Taka-hisa Arima +1
Ferroic multipole orders break some symmetry and often activate unique physical properties, such as nonreciprocal directional dichroism and linear magnetoelectric effects. Here, we…
Imaging antiferromagnetic domains in LiCoPO via the optical magnetoelectric effect
B. Tóth, V. Kocsis, Y. Tokunaga +3
Antiferromagnetic (AFM) materials are considered as promising building blocks of novel data storage devices, still, detecting and manipulating AFM domains have remained challenging…
Molecular-Orbital Degeneracy Lifting and Suppression of a Flat-Band Metal in a Tetrahedral Cluster System NbSeI
Keita Kojima, Youichi Yamakawa, Ryutaro Okuma +7
The lifting of degenerate electronic states has been extensively studied in transition metal compounds, where diverse quantum phenomena arise from the degrees of freedom of d elect…
Linear tetramer formation in nonmagnetic pyrochlore niobate
Shota Nishida, Shunsuke Kitou, Shingo Toyoda +3
We investigate displacive short-range order in pyrochlore Y2Nb2O7, which exhibits a nonmagnetic insulating state despite the presence of formally tetravalent Nb4+ (S = 1/2) ions on…
Effect of uniaxial stress on helimagnetic phases in the square-lattice itinerant magnet EuAl
Masaki Gen, Takuya Nomoto, Hiraku Saito +5
We investigate uniaxial-stress effects on the magnetic phase diagram of the square-lattice itinerant magnet EuAl, where strong coupling among spin, lattice, and charge produc…
Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal-Organic Framework
Shunsuke Kitou, Hajime Ishikawa, Yusuke Tokunaga +8
Among the thirty-two crystallographic point groups, 432 is the only one that lacks an inversion center but does not exhibit piezoelectricity. A gyroidal structure belongs to point…
Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets
Masato Ueno, Takashi Kurumaji, Shunsuke Kitou +4
Honeycomb-lattice antiferromagnets have attracted wide attention for exploration of exotic heat transport and their interplay with magnetic excitations. In this work, we have revea…
Spin-lattice-coupled helical magnetic order in breathing pyrochlore magnets, CuAlCrS and CuGaCrS
Masaki Gen, Taro Nakajima, Hiraku Saito +2
We report low-temperature powder X-ray and neutron diffraction studies on breathing pyrochlore magnets CuCrS ( = Al, Ga), which undergo a magnetic transition at $…
Cluster rearrangement by chiral charge order in lacunar spinel GaNbSe
Shunsuke Kitou, Masaki Gen, Yuiga Nakamura +2
Transition-metal atoms with d electrons sometimes form clusters in crystals, which significantly affects the physical properties. Such a cluster formation frequently accompanies a…
Breathing pyrochlore magnet CuGaCrS: Magnetic, thermodynamic, and dielectric properties
M. Gen, H. Ishikawa, A. Miyake +11
We investigate the crystallographic and magnetic properties of a chromium-based thiospinel CuGaCrS. From a synchrotron x-ray diffraction experiment and structural refin…
Metamagnetic transitions and magnetoelectric responses in a chiral polar helimagnet NiInSbO
Yusuke Araki, Tatsuki Sato, Yuri Fujima +13
Magnetic-field effect on the magnetic and electric properties in a chiral polar ordered corundum NiInSbO has been investigated. Single-crystal soft x-ray and neutron diffra…
Spin excitations of magnetoelectric LiNiPO in multiple magnetic phases
Laur Peedu, Vilmos Kocsis, Dávid Szaller +11
Spin excitations of magnetoelectric LiNiPO are studied by infrared absorption spectroscopy in the THz spectral range as a function of magnetic field through various commensurat…
Directional dichroism in the paramagnetic state of multiferroics: a case study of infrared light absorption in Sr2CoSi2O7 at high temperatures
J. Viirok, U. Nagel, T. Rõõm +12
The coexisting magnetic and ferroelectric orders in multiferroic materials give rise to a handful of novel magnetoelectric phenomena, such as the absorption difference for the oppo…
Emergent topological spin structures in a centrosymmetric cubic perovskite
S. Ishiwata, T. Nakajima, J. -H. Kim +18
The skyrmion crystal (SkX) characterized by a multiple-q helical spin modulation has been reported as a unique topological state that competes with the single-q helimagnetic order…
Thermal generation of spin current in a helimagnetic multiferroic hexaferrite
R. Takagi, S. Seki, Y. Tokunaga +3
We report the experimental observation of longitudinal spin Seebeck effect in a multiferroic helimagnet Ba0.5Sr1.5Zn2Fe12O22. Temperature gradient applied normal to Ba0.5Sr1.5Zn2Fe…
Origin of forbidden reflections in multiferroic BaCoGeO by neutron diffraction: Symmetry lowering or Renninger effect?
Andrew Sazonov, Martin Meven, Georg Roth +4
For a symmetry consistent theoretical description of the multiferroic phase of BaCoGeO a precise knowledge of its crystal structure is a prerequisite. In our previous s…
Versatile helimagnetic phases under magnetic fields in cubic perovskite SrFeO3
S. Ishiwata, M. Tokunaga, Y. Kaneko +7
A helical spin texture is of great current interest for a host of novel spin-dependent transport phenomena. We report a rich variety of nontrivial, helimagnetic phases in the simpl…
Magnetic-field induced competition of two multiferroic orders in a triangular-lattice helimagnet MnI2
T. Kurumaji, S. Seki, S. Ishiwata +4
Magnetic and dielectric properties with varying magnitude and direction of magnetic field H have been investigated for a triangular lattice helimagnet MnI2. The in-plane electric p…
Cupric chloride CuCl2 as an S=1/2 chain multiferroic
S. Seki, T. Kurumaji, S. Ishiwata +6
Magnetoelectric properties were investigated for an S=1/2 chain antiferromagnet CuCl2, which turns out to be the first example of non-chalcogen based spiral-spin induced multiferro…
Perovskite Manganites Hosting Versatile Multiferroic Phases with Symmetric and Antisymmetric Exchange Strictions
S. Ishiwata, Y. Kaneko, Y. Tokunaga +3
Complete magnetoelectric (ME) phase diagrams of orthorhombic MnO with and without magnetic moments on the ions have been established. Three kinds of multiferroic groun…