70 citations · 309 across the 40 of their papers we have counts for
29 papers · 1 filter
Observation of complex orbital order in MnV2O4
Chihaya Koyama, Shunsuke Kitou, Taishun Manjo +8
Orbital ordering in vanadium spinel oxides with a geometrically frustrated pyrochlore structure has been a subject of controversy, owing to competing theoretical models and the abs…
Observation of g-wave altermagnetic multipole
Ryo Misawa, Rikuto Oiwa, Shunsuke Kitou +16
Over the past few years, altermagnets have emerged as a new class of collinear magnets with broken time-reversal symmetry, offering novel opportunities for spintronics beyond conve…
Correlated topological-polarization surface states in the narrow-gap insulator FeSb2
Takahiro Iwagaki, Hideki Matsuoka, Ginta Hoshino +7
Strong electron correlations and band topology each generate rich quantum phases, but conflicting elemental requirements have largely kept them apart. Topological polarization offe…
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…
Real-space determination of orbital states driving successive phase transitions in FeV2O4
Chihaya Koyama, Yusuke Nomura, Shunsuke Kitou +8
Direct experimental access to orbital states in strongly correlated materials remains a major challenge, despite their central role in driving coupled structural and magnetic phase…
Experimental quantification of electronic symmetry breaking through orbital hybridization phase
Shungo Aoyagi, Shunsuke Kitou, Yuiga Nakamura +2
Symmetry classification of crystal structures has been central to predicting physical properties of materials. While such structural classification identifies which physical respon…
Bond-density-wave orders induced by geometric frustration in the kagome metal CeRu3Si2
Ryo Misawa, Shunsuke Kitou, Rinsuke Yamada +9
Geometric frustration gives rise to vast manifolds of degenerate ground states and competing orders in spin and charge systems. Typically, classical ground states are governed by a…
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…
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…
Successive orthorhombic distortions in kagome metals by molecular orbital formation
Ryo Misawa, Shunsuke Kitou, Rinsuke Yamada +12
The kagome lattice, with its inherent frustration, hosts a plethora of exotic phenomena, including the emergence of charge density wave order. The high rotational sym…
Visualization of Co 3d high- and low-spin states via valence electron density
Kamini Gautam, Shunsuke Kitou, Yuiga Nakamura +5
Properties of trivalent cobalt oxides are governed by the spin and orbital states of Co3+ ions, which are strongly coupled to their local coordination environments and chemical bon…
Current-induced successive structural phase transitions beyond thermal equilibrium in single-crystal VO2
Shunsuke Kitou, Akitoshi Nakano, Masato Imaizumi +5
Nonequilibrium systems driven by external energy sources host unexplored physics; yet phase transitions beyond thermal equilibrium remain elusive. Here, we demonstrate that electri…
Perfectly harmonic spin cycloid and multi- textures in the Weyl semimetal GdAlSi
Ryota Nakano, Rinsuke Yamada, Juba Bouaziz +18
A fundamental question concerns how topological electronic states are influenced by many-body correlations, and magnetic Weyl semimetals represent an important material platform to…
Visualization of spin-orbit entangled 4f electrons in crystalline materials
Shunsuke Kitou, Kentaro Ueda, Yuiga Nakamura +5
Lanthanide 4f electrons are strongly influenced by spin-orbit coupling, resulting in well-defined J multiplets, which are further split by the crystalline electric field in condens…
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…
Metamagnetic multiband Hall effect in Ising antiferromagnet ErGa
Takashi Kurumaji, Shiang Fang, Linda Ye +2
Frustrated rare-earth-based intermetallics provide a promising platform for emergent magnetotransport properties through exchange coupling between conduction electrons and localize…
Metamagnetism and anomalous magnetotransport properties in rare-earth-based polar semimetals AuGe ( Dy, Ho, and Gd)
Takashi Kurumaji, Masaki Gen, Shunsuke Kitou +1
We report the magnetic, magnetoelastic, and magnetotransport properties of single crystals of polar magnets AuGe ( Dy, Ho, and Gd), grown by Au-Ge self-flux. Magnetization a…
Canted antiferromagnetism in a spin-orbit coupled triangular-lattice magnet DyAuGe
Takashi Kurumaji, Masaki Gen, Shunsuke Kitou +5
Exploration of nontrivial magnetic states induced by strong spin-orbit interaction is a central topic of frustrated magnetism. Extensive studies are concentrated on rare-earth-base…
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…
Molecular orbital formation and metastable short-range ordered structure in VO
Shunsuke Kitou, Akitoshi Nakano, Masato Imaizumi +3
The metal-insulator transition (MIT) in vanadium dioxide VO due to V-V dimerization has been extensively discussed for decades. While it is widely acknowledged that electron co…
Observation of local atomic displacements intrinsic to the double zigzag chain structure of 1T-MTe2 (M = V, Nb, Ta)
N. Katayama, Y. Matsuda, K. Kojima +7
We describe the existence of local distortion discovered in the synchrotron x-ray single-crystal structure analysis of layered ditelluride 1T-MTe2 (M = V, Nb, Ta). In 1T-TaTe2, the…
Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO
Shunsuke Kitou, Masaki Gen, Yuiga Nakamura +4
An anomalously high valence state sometimes shows up in transition-metal oxide compounds. In such systems, holes tend to occupy mainly the ligand orbitals, giving rise to inter…
Anisotropic magnetotransport properties coupled with spiral spin modulation in a triangular-lattice magnet EuZnGe
Takashi Kurumaji, Masaki Gen, Shunsuke Kitou +3
We investigate the thermodynamic, magnetic, and electrical transport properties of a triangular-lattice antiferromagnet EuZnGe using single crystals grown from Eu-Zn flux in sealed…