Y. Haraguchi

activity

20182026

most citedObservation of topological flat bands in the kagome semiconductor Nb

_{3}

_{8}

145 citations · 323 across the 28 of their papers we have counts for

collaborators

28 papers

cond-mat.str-el2026

Spin--orbit-enhanced correlation sensitivity and anomalous magnetic response in non-dimerized $4 d^{4}$ ilmenite CdRuO $_{3}$

Yuya Haraguchi, Hayato Yatsuzuka, Hiroko Aruga Katori

We report the synthesis and physical properties of CdRuO $_{3}$ , a nominal Ru $^{4 +}$ $4 d^{4}$ ilmenite with edge-sharing RuO $_{6}$ honeycomb layers. Powder X-ray diffraction establishes a…

cond-mat.str-el2026

Tetrahedrally ferromagnetic correlations and a glassy-freezing anomaly in the breathing pyrochlore magnet $AgInC r_{4} S_{8}$ with partial $A$ -site disorder

Yuya Haraguchi, Masahiro Kitamura, Masaki Gen +6

We investigate the chromium breathing pyrochlore sulfide $AgInC r_{4} S_{8}$ , a chromium-based thiospinel, by synchrotron x-ray and neutron powder diffraction, dc magnetization,…

cond-mat.mtrl-sci2026

Selective Octahedral Accommodation of Cr $^{3 +}$ and Weak Magnetic Connectivity in the Sugilite Analogue KNa $_{2}$ Cr $_{2}$ Li $_{3}$ Si $_{12}$ O $_{30}$

Yuya Haraguchi, Taishu Aoki, Daisuke Nishio-Hamane +1

We report the synthesis of the Cr analogue of sugilite, KNa $_{2}$ Cr $_{2}$ Li $_{3}$ Si $_{12}$ O $_{30}$ , in the milarite-type framework. Rietveld refinement of a composition-conserving antisi…

cond-mat.str-el2026

Frustrated Magnetism of the $S = 1$ Trillium-Lattice Oxide Li $_{2}$ NiGe $_{3}$ O $_{8}$

Yuya Haraguchi

We report magnetization and heat-capacity measurements on the ordered-spinel oxide Li $_{2}$ NiGe $_{3}$ O $_{8}$ , where Ni $^{2 +}$ ions with $S = 1$ form a single three-dimensional trillium l…

cond-mat.str-el2026

Evolution of crystal field and intraionic interactions in the ilmenite $A$ IrO $_{3}$ ( $A$ = Mg, Zn, Cd) and hyperhoneycomb $β$ -ZnIrO $_{3}$

Yuya Haraguchi, Hiroko Aruga Katori, Kenji Ishii +1

Spin-orbit Mott insulators with the $t_{2 g}^{5}$ electron configuration are promising platforms for the Kitaev spin liquid, yet fine-tuning of their crystal structures is essential t…

cond-mat.mtrl-sci2026

Ilmenite-Type Ca $_{x}$ IrO $_{3}$ via Topochemical Ion Exchange: Stacking Faults and Low-Temperature Magnetic Anomaly

Haruki Kira, Yuya Haraguchi, Wataru Yokoshima +2

We report the synthesis of an ilmenite-type polymorph of Ca $_{x}$ IrO $_{3}$ distinct from the known post-perovskite and perovskite phases, via low-temperature topochemical Ca $^{2 +}$ /2Na…

cond-mat.str-el2025

Crystalline water intercalation into the Kitaev honeycomb cobaltate Na $_{2}$ Co $_{2}$ TeO $_{6}$

Masaaki Ito, Yuya Haraguchi, Teruki Motohashi +4

We herein report the successful intercalation of water molecules into the layered honeycomb lattice of Na $_{2}$ Co $_{2}$ TeO $_{6}$ , a Kitaev-candidate compound, to obtain the hydrated phas…

cond-mat.str-el2025

Frustrated $J_{1} - J_{2}$ Diamond Lattice Antiferromagnet Co $_{2}$ Ti $_{3}$ O $_{8}$ with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction

Rio Kumeda, Yuya Haraguchi, Daisuke Nishio-Hamane +3

Metastable Co $_{2}$ Ti $_{3}$ O $_{8}$ was synthesized through a topochemical reaction using Li $_{2}$ CoTi $_{3}$ O $_{8}$ as the precursor, resulting in a vacancy-ordered spinel structure. Crystal st…

cond-mat.str-el2025★ 1 cited

One-third magnetization plateau in a spin-1 kagome magnet BaNi $_{3}$ (AsO $_{4}$ ) $_{2}$ (OH) $_{2}$

Yuya Haraguchi, Jun-ichi Yamaura, Akira Matsuo +2

We investigate the structural and magnetic properties of BaNi $_{3}$ (AsO $_{4}$ ) $_{2}$ (OH) $_{2}$ , focusing on its spin-1 kagome lattice and the intricate coexistence of ferromagnetic and ant…

cond-mat.str-el2025★ 5 cited

Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO $_{4}$

Yuya Haraguchi, Daisuke-Nishio Hamane, Hiroko Aruga Katori

We report the synthesis, crystal structure, and magnetic properties of a new Kitaev honeycomb cobaltate, KCoAsO $_{4}$ , which crystallizes in two distinct forms: $P 2/ c$ and $R 3 ˉ$ …

cond-mat.str-el2024★ 10 cited

CaCo $_{2}$ TeO $_{6}$ : A topochemically prepared 3 $d^{7}$ honeycomb Kitaev magnet

Yuya Haraguchi, Yuto Yoshida, Akira Matsuo +2

We report the magnetic properties of CaCo $_{2}$ TeO $_{6}$ as a Kitaev candidate. CaCo $_{2}$ TeO $_{6}$ was synthesized through a topochemical process, wherein all Na $^{+}$ ions in Na $_{2}$ Co $_{2}$ T…

cond-mat.str-el2024

Magnetic ordering of the Mo $_{3}$ O $_{8}$ -type cluster Mott insulator Na $_{3}$ Sc $_{2}$ (MoO $_{4}$ ) $_{2}$ Mo $_{3}$ O $_{8}$ with spin-1/2 triangular lattice prepared via optimal synthesis

Yuya Haraguchi, Daigo Ishikita, Hiroko Aruga Katori

We detail the optimized synthesis of the Mo $_{3}$ O $_{8}$ -type cluster Mott insulator (CMI) Na $_{3}$ Sc $_{2}$ (MoO $_{4}$ ) $_{2}$ Mo $_{3}$ O $_{8}$ , which has been considered a candidate for realizing the…

cond-mat.mtrl-sci2024★ 7 cited

Molecular Orbital Electronic Instability in the van der Waals Kagome Semiconductor Nb $_{3}$ Cl $_{8}$ : Exploring Future Directions

Yuya Haraguchi, Kazuyoshi Yoshimura

Nb $_{3}$ Cl $_{8}$ , a cluster Mott insulator with a distinctive magnetic molecular orbital structure organized into a breathing kagome lattice, showcases critical phase transitions under…

cond-mat.mtrl-sci2024★ 5 cited

High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu $_{2}$ IrO $_{3}$

Yuya Haraguchi, Daisuke Nishio-Hamane, Akira Matsuo +2

By incorporating inert KCl into the Na $_{2}$ IrO $_{3}$ + 2CuCl $\to$ Cu $_{2}$ IrO $_{3}$ + 2NaCl topochemical reaction, we significantly reduced the synthesis temperature of Cu $_{2}$ IrO $_{3}$ fro…

cond-mat.str-el2023★ 2 cited

Impact of Oxidation State on the Valence-bond-glass Physics in the lithium-intercalated Mo $_{3}$ O $_{8}$ Cluster Mott Insulators

Daigo Ishikita, Yuya Haraguchi, Hiroko Aruga Katori

We have successfully synthesized four Mo $_{3}$ O $_{8}$ -type cluster Mott insulators (CMI) by intercalating lithium into nonmagnetic precursors to regulate the Mo $_{3}$ cluster valence. Th…

cond-mat.str-el2023★ 3 cited

Monoclinic distortion in hyperhoneycomb Kitaev material $β$ -ZnIrO $_{3}$ revealed by improved sample quality

Yuya Haraguchi, Hiroko Aruga Katori

The sample quality of the hyperhoneycomb lattice Kitaev magnet $β$ -ZnIrO $_{3}$ was successfully improved by removing the maximum amount of moisture from the reaction ampoule. The X-r…

cond-mat.str-el2023★ 1 cited

Magnetic ordering in the $J_{eff}$ = 0 Nickelate NiRh $_{2}$ O $_{4}$ prepared via a solid-state metathesis

Yuya Haraguchi, Daisuke Nishio-Hamane, Hiroko Aruga Katori

In spinel-type nickelate NiRh $_{2}$ O $_{4}$ , magnetic ordering is observed upon the sample synthesized via kinetically controlled low-temperature solid-state metathesis, as opposed to p…

cond-mat.str-el2023★ 1 cited

Magnetic field induced valence change in Eu(Co $_{1 - x}$ Ni $_{x}$ ) $_{2}$ P $_{2}$ up to 60 T

Raito Nakamura, Azumi Ishita, Jin Nakamura +8

The solid solution 122 compounds, Eu(Co $_{1 - x}$ Ni $_{x}$ ) $_{2}$ P $_{2}$ , show valence transition between divalent state and intermediate valence states at Eu, which is firmly correla…

cond-mat.str-el2022★ 15 cited

Perfect kagome-lattice antiferromagnets with J $_{e f f}$ = 1/2: The Co $^{2 +}$ -analogs of copper minerals volborthite and vesignieite

Yuya Haraguchi, Takehiro Ohnoda, Akira Matsuo +2

We report the synthesis, crystal structure, and magnetic properties of Co $^{2 +}$ kagome magnets Co $_{3}$ V $_{2}$ O $_{7}$ (OH) $_{2}$ $\cdot$ 2H $_{2}$ O and BaCo $_{3}$ (VO $_{4}$ ) $_{2}$ (OH) $_{2}$ , which can b…

cond-mat.str-el2022

Honeycomb lattice iridate on the verge of Mott-collapse

Yuya Haraguchi, Hiroko Aruga Katori

A new honeycomb lattice iridate (La,Na)IrO $_{3}$ ( $\approx$ LaNaIr $_{2}$ O $_{6}$ ) is successfully synthesized from the spin-orbit coupled Mott insulator Na $_{2}$ IrO $_{3}$ by replacing the int…

cond-mat.mtrl-sci2022★ 1 cited

Magnetism of Al $_{x}$ Fe $_{2 - x}$ GeO $_{5}$ with Andalusite Structure

K. Kakimoto, S. Takada, H. Ohta +8

The magnetism of Al $_{x}$ Fe $_{2 - x}$ GeO $_{5}$ from $x$ = 0.09 to $x$ = 0.91 with andalusite structure was examined. The magnetic properties of Al $_{x}$ Fe $_{2 - x}$ GeO $_{5}$ at low temperature…

cond-mat.str-el2022★ 10 cited

Quantum paramagnetism in the hyperhoneycomb Kitaev magnet $β$ -ZnIrO $_{3}$

Yuya Haraguchi, Akira Matsuo, Koichi Kindo +1

A polycrystalline sample of the hyperhoneycomb iridate $β$ -ZnIrO $_{3}$ was synthesized via a topochemical reaction, and its structural, magnetic, and thermodynamic properties were in…

cond-mat.str-el2021★ 24 cited

Quantum antiferromagnet bluebellite comprising a maple-leaf lattice made of spin-1/2 Cu $^{2 +}$ ions

Yuya Haraguchi, Akira Matsuo, Koichi Kindo +1

Spin-1/2 maple leaf lattice antiferromagnets are expected to show interesting phenomena originating from frustration effects and quantum fluctuations. We report the hydrothermal sy…

cond-mat.mtrl-sci2021★ 145 cited

Observation of topological flat bands in the kagome semiconductor Nb $_{3}$ Cl $_{8}$

Zhenyu Sun, Hui Zhou, Cuixiang Wang +12

The destructive interference of wavefunctions in a kagome lattice can give rise to topological flat bands (TFBs) with a highly degenerate state of electrons. Recently, TFBs have be…

Spin--orbit-enhanced correlation sensitivity and anomalous magnetic response in non-dimerized 4d4 ilmenite CdRuO3​

Tetrahedrally ferromagnetic correlations and a glassy-freezing anomaly in the breathing pyrochlore magnet AgInCr4​S8​ with partial A-site disorder

Selective Octahedral Accommodation of Cr3+ and Weak Magnetic Connectivity in the Sugilite Analogue KNa2​Cr2​Li3​Si12​O30​

Frustrated Magnetism of the S=1 Trillium-Lattice Oxide Li2​NiGe3​O8​

Evolution of crystal field and intraionic interactions in the ilmenite AIrO3​ (A = Mg, Zn, Cd) and hyperhoneycomb β-ZnIrO3​

Ilmenite-Type Cax​IrO3​ via Topochemical Ion Exchange: Stacking Faults and Low-Temperature Magnetic Anomaly

Crystalline water intercalation into the Kitaev honeycomb cobaltate Na2​Co2​TeO6​

Frustrated J1​−J2​ Diamond Lattice Antiferromagnet Co2​Ti3​O8​ with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction

One-third magnetization plateau in a spin-1 kagome magnet BaNi3​(AsO4​)2​(OH)2​

Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO4​

CaCo2​TeO6​: A topochemically prepared 3d7 honeycomb Kitaev magnet

Magnetic ordering of the Mo3​O8​-type cluster Mott insulator Na3​Sc2​(MoO4​)2​Mo3​O8​ with spin-1/2 triangular lattice prepared via optimal synthesis

Molecular Orbital Electronic Instability in the van der Waals Kagome Semiconductor Nb3​Cl8​: Exploring Future Directions

High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu2​IrO3​

Impact of Oxidation State on the Valence-bond-glass Physics in the lithium-intercalated Mo3​O8​ Cluster Mott Insulators

Monoclinic distortion in hyperhoneycomb Kitaev material β-ZnIrO3​ revealed by improved sample quality

Magnetic ordering in the Jeff​ = 0 Nickelate NiRh2​O4​ prepared via a solid-state metathesis

Magnetic field induced valence change in Eu(Co1−x​Nix​)2​P2​ up to 60 T

Perfect kagome-lattice antiferromagnets with Jeff​ = 1/2: The Co2+-analogs of copper minerals volborthite and vesignieite

Honeycomb lattice iridate on the verge of Mott-collapse

Magnetism of Alx​Fe2−x​GeO5​ with Andalusite Structure

Quantum paramagnetism in the hyperhoneycomb Kitaev magnet β-ZnIrO3​

Quantum antiferromagnet bluebellite comprising a maple-leaf lattice made of spin-1/2 Cu2+ ions

Observation of topological flat bands in the kagome semiconductor Nb3​Cl8​

Spin--orbit-enhanced correlation sensitivity and anomalous magnetic response in non-dimerized $4 d^{4}$ ilmenite CdRuO $_{3}$

Tetrahedrally ferromagnetic correlations and a glassy-freezing anomaly in the breathing pyrochlore magnet $AgInC r_{4} S_{8}$ with partial $A$ -site disorder

Selective Octahedral Accommodation of Cr $^{3 +}$ and Weak Magnetic Connectivity in the Sugilite Analogue KNa $_{2}$ Cr $_{2}$ Li $_{3}$ Si $_{12}$ O $_{30}$

Frustrated Magnetism of the $S = 1$ Trillium-Lattice Oxide Li $_{2}$ NiGe $_{3}$ O $_{8}$

Evolution of crystal field and intraionic interactions in the ilmenite $A$ IrO $_{3}$ ( $A$ = Mg, Zn, Cd) and hyperhoneycomb $β$ -ZnIrO $_{3}$

Ilmenite-Type Ca $_{x}$ IrO $_{3}$ via Topochemical Ion Exchange: Stacking Faults and Low-Temperature Magnetic Anomaly

Crystalline water intercalation into the Kitaev honeycomb cobaltate Na $_{2}$ Co $_{2}$ TeO $_{6}$

Frustrated $J_{1} - J_{2}$ Diamond Lattice Antiferromagnet Co $_{2}$ Ti $_{3}$ O $_{8}$ with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction

One-third magnetization plateau in a spin-1 kagome magnet BaNi $_{3}$ (AsO $_{4}$ ) $_{2}$ (OH) $_{2}$

Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO $_{4}$

CaCo $_{2}$ TeO $_{6}$ : A topochemically prepared 3 $d^{7}$ honeycomb Kitaev magnet

Magnetic ordering of the Mo $_{3}$ O $_{8}$ -type cluster Mott insulator Na $_{3}$ Sc $_{2}$ (MoO $_{4}$ ) $_{2}$ Mo $_{3}$ O $_{8}$ with spin-1/2 triangular lattice prepared via optimal synthesis

Molecular Orbital Electronic Instability in the van der Waals Kagome Semiconductor Nb $_{3}$ Cl $_{8}$ : Exploring Future Directions

High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu $_{2}$ IrO $_{3}$

Impact of Oxidation State on the Valence-bond-glass Physics in the lithium-intercalated Mo $_{3}$ O $_{8}$ Cluster Mott Insulators

Monoclinic distortion in hyperhoneycomb Kitaev material $β$ -ZnIrO $_{3}$ revealed by improved sample quality

Magnetic ordering in the $J_{eff}$ = 0 Nickelate NiRh $_{2}$ O $_{4}$ prepared via a solid-state metathesis

Magnetic field induced valence change in Eu(Co $_{1 - x}$ Ni $_{x}$ ) $_{2}$ P $_{2}$ up to 60 T

Perfect kagome-lattice antiferromagnets with J $_{e f f}$ = 1/2: The Co $^{2 +}$ -analogs of copper minerals volborthite and vesignieite

Magnetism of Al $_{x}$ Fe $_{2 - x}$ GeO $_{5}$ with Andalusite Structure

Quantum paramagnetism in the hyperhoneycomb Kitaev magnet $β$ -ZnIrO $_{3}$

Quantum antiferromagnet bluebellite comprising a maple-leaf lattice made of spin-1/2 Cu $^{2 +}$ ions

Observation of topological flat bands in the kagome semiconductor Nb $_{3}$ Cl $_{8}$