Hiroshi Takatsu

Balancing Oxygen-Defect Formation and Local Metallic Screening in Mg-Doped Pr2Ir2O7 Pyrochlore Electrocatalysts for Acidic Oxygen Evolution

Kenji Tanaka, Jiayuan Ni, Yuto Miyahara, Akinori Irizawa et autres

Aliovalent A-site doping of pyrochlore oxides is a powerful strategy for enhancing the acidic oxygen evolution reaction (OER) through oxygen defect formation; however, the factors governing the practical limits of such defect engineering remain unclear. Herein, we show that the OER activity …

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Ferromagnetic-like behavior emerging from local CoO 6 honeycomb motifs in Co-doped NaSbO 3 thin films

Hao‐Bo Li, Weitao Yan, Shunsuke Kobayashi, Kousuke Ooe et autres

The strongly correlated oxides with a honeycomb lattice have attracted vast attention due to their interesting magnetic behaviors and emergent quantum effects such as Majorana fermions generated from Kitaev spin liquid. High-quality single crystal samples with delicately controlled composition and strain are …

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Single Crystal Growth and Easy-Plane Anisotropic Magnetism of Distorted T26-Type Non-Archimedean Antiferromagnet Cu 3 O 2 (HSeO 3 )(HSO 4 )(H 2 O) with 1/3-Magnetization Plateau

Nian Shi, Yue Wang, Hui Li, Yun Lv et autres

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A S = 3/2 Quasi-One-Dimensional Antiferromagnet CrF 3 (4,4′-Bipyridyl) Exhibiting Strong Intrachain Interaction

Yanhong Wang, Yun Lv, Hui Li, Yaling Dou et autres

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Magnetic Copper Selenite-Sulfate Cu 3 O 2 (HSeO 3 )(HSO 4 )(H 2 O) with T26-Type Non-Archimedean Lattice Featuring a Robust 1/3-Magnetization Plateau

Nian Shi, Yue Wang, Hui Li, Yun Lv et autres

Discovering novel magnetic materials with unique spin–lattices for exotic quantum phenomena is a significant challenge. Here, we successfully synthesized a new antiferromagnet, Cu 3 O 2 (HSeO 3 )(HSO 4 )(H 2 O), using mixed-anions of trigonal-pyramidal SeO 3 2– and tetrahedral …

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Lattice softening and diffusive dynamics in the polar metal LiReO 3

Kantaro Murayama, Ryota Masuki, Cédric Tassel, Hideaki Sakai et autres

Polar metals, characterized by the nontrivial coexistence of metallicity and polar structural order, define an emerging frontier in quantum materials research. However, the interplay between their structural phase transitions and fluctuation dynamics remains poorly understood. Here, we reveal distinct diffusive dynamics in …

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Lattice softening and diffusive dynamics in the polar metal LiReO 3

Kantaro Murayama, Ryota Masuki, Cédric Tassel, Hideaki Sakai et autres

Polar metals, characterized by the nontrivial coexistence of metallicity and polar structural order, define an emerging frontier in quantum materials research.However, the interplay between their structural phase transitions and fluctuation dynamics remains poorly understood.Here, we reveal distinct diffusive dynamics in metallic lithium …

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Chemically Defined Ln 2 H 3– x N Nitride-Hydrides via High-Pressure Synthesis and Topochemical Hydrogen Intercalation

Zefeng Wei, Hiroshi Takatsu, Hiroki Ubukata, Daichi Kato et autres

The controversial claim of near-ambient superconductivity in anion-excess fluorite-type nitrogen-doped lutetium hydride (LuH 3 −δ N ε ) has renewed interest in mixed-anion hydrides as platforms for emergent electronic properties, while highlighting the need for systems with well-defined structural and compositional control. …

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Hydride-Buffered Absence of Local Distortions in Mixed-Valent EuVO 2 H Films Revealed by X-ray Fluorescence Holography

Hiroshi Takatsu, Koji Kimura, Morito Namba, Masayuki Ochi et autres

Valence transitions in europium compounds, such as EuO and EuNi 2 (Si 1– x Ge x ) 2, usually induce substantial structural distortions because the ionic radius difference between Eu 2+ (1.25 Å) and Eu 3+ (1.06 Å) exceeds the Hume–Rothery tolerance. …

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Reductive-defect-suppressed titanium oxynitrides via Ca 3 N 2 -assisted topochemical nitridation

Yuki Sasahara, Kento Yoshii, Daichi Kato, Issei Yamamoto et autres

One-step, ammonia-free topochemical nitridation using Ca 3 N 2 enables 3O 2− /2N 3− anion exchange from BaTiO 3 while suppressing Ti 3+ -related reductive defects, yielding bright-orange oxynitrides.

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Topochemical Reaction Involving Double-to-Single Layer Conversion: Mo 3 Ta 2 O 10 N with a Kagomé Lattice

Ryoya Higuchi, K. Ishida, Cédric Tassel, Baptiste Vignolle et autres

Topochemical reactions in transition metal oxides, typically involving oxygen removal or anion exchange, provide a versatile platform for creating metastable phases with diverse functionalities. While these reactions often modify the valence and coordination environment of transition metals, the underlying metal frameworks are …

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Epitaxial Growth of Triple-Layered Brownmillerite Cobalt Oxide Sr4Co3O9

Hao‐Bo Li, Shunsuke Kobayashi, Weitao Yan, Binjie Chen et autres

Layered perovskite oxides with the Ruddlesden–Popper (RP) structure exhibit diverse functionalities, yet the synthesis of cobalt-based RP oxides is hindered by competing phase formation. In this study, we successfully synthesized Sr 4 Co 3 O 9, a triple-layered cobalt oxide with a …

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