Koichi Kindo
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View article: Chemically tunable quantum magnetism on the anisotropic triangular lattice in rhenium oxyhalides
Chemically tunable quantum magnetism on the anisotropic triangular lattice in rhenium oxyhalides Open
The spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice (ATL) is an archetypal spin system hosting exotic quantum magnetism and dimensional crossover. However, the progress in experimental research on this field has be…
View article: Systematic evolution of superconducting pairing strength and Seebeck coefficients in correlated infinite-layer La <sub> 1– <i>x</i> </sub> Sr <i> <sub>x</sub> </i> NiO <sub>2</sub>
Systematic evolution of superconducting pairing strength and Seebeck coefficients in correlated infinite-layer La <sub> 1– <i>x</i> </sub> Sr <i> <sub>x</sub> </i> NiO <sub>2</sub> Open
The recently found superconducting infinite-layer nickelates offer a unique platform to explore an exotic pairing mechanism in multiband systems toward high-temperature superconductivity and associated rich quantum phases, contrasting with…
View article: Quantum phase with spontaneous translational symmetry breaking in an extended diamond chain
Quantum phase with spontaneous translational symmetry breaking in an extended diamond chain Open
We report the experimental realization of a spin-1/2 extended diamond chain in a verdazyl-Cu complex, where competing interactions and lattice distortions give rise to exotic quantum phases. The magnetic properties exhibit a zero-field ene…
View article: Unified description of spin-lattice coupling: application to thermodynamic properties of the pyrochlore Heisenberg antiferromagnet
Unified description of spin-lattice coupling: application to thermodynamic properties of the pyrochlore Heisenberg antiferromagnet Open
We present an extended model to describe the spin-lattice coupling, incorporating individual vibrations of bonds and atomic sites alongside distance-dependent exchange interactions. The proposed spin Hamiltonian can be effectively consider…
View article: Miniaturized and robust tunable monochromatic magneto-optical platform for pulsed magnetic fields
Miniaturized and robust tunable monochromatic magneto-optical platform for pulsed magnetic fields Open
Tunable monochromatic magneto-transmission is one of the most established magneto-optical techniques, particularly well suited for pulsed magnetic fields. It employs fixed-wavelength monochromatic light as the probe, while the magnetic fie…
View article: Frustrated <i>J</i><sub>1</sub>–<i>J</i><sub>2</sub> Diamond Lattice Antiferromagnet Co<sub>2</sub>Ti<sub>3</sub>O<sub>8</sub> with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction
Frustrated <i>J</i><sub>1</sub>–<i>J</i><sub>2</sub> Diamond Lattice Antiferromagnet Co<sub>2</sub>Ti<sub>3</sub>O<sub>8</sub> with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction Open
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 structure analysis confirmed that Co ions selectively occupy …
View article: Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution
Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution Open
Nodal‐line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal‐line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent t…
View article: Anomalous Electrical Transport in the Kagome Magnet YbFe$_6$Ge$_6$
Anomalous Electrical Transport in the Kagome Magnet YbFe$_6$Ge$_6$ Open
Two-dimensional (2D) kagome metals offer a unique platform for exploring electron correlation phenomena derived from quantum many-body effects. Here, we report a combined study of electrical magnetotransport and neutron scattering on YbFe$…
View article: Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework
Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework Open
Among the thirty-two crystallographic point groups, 432 is the only one that lacks an inversion center but does not exhibit piezoelectricity. A gyroidal structure belongs to point group 432 and shows characteristic physical properties attr…
View article: Electronic Structure of Kramers Nodal-Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare-Earth Substitution
Electronic Structure of Kramers Nodal-Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare-Earth Substitution Open
Nodal-line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal-line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent t…
View article: CaCo$_2$TeO$_6$: A topochemically prepared 3$d^7$ honeycomb Kitaev magnet
CaCo$_2$TeO$_6$: A topochemically prepared 3$d^7$ honeycomb Kitaev magnet Open
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$_2$TeO$_6$ were replaced with half the amount of Ca$^{2+}$ ions…
View article: Properties of an organic model $S=1$ Haldane chain system
Properties of an organic model $S=1$ Haldane chain system Open
We present the properties of a new organic $S=1$ antiferromagnetic chain system $m$-NO$_2$PhBNO (abbreviated BoNO). In this biradical system two unpaired electrons from aminoxyl groups are strongly ferromagnetically coupled ($|J_\text{FM}|…
View article: Crystal-field magnetostriction of the spin ice under ultrahigh magnetic fields
Crystal-field magnetostriction of the spin ice under ultrahigh magnetic fields Open
We present a comprehensive study of the magnetoelastic properties of the Ising pyrochlore oxide Ho$_{2}$Ti$_{2}$O$_{7}$, known as spin ice, by means of high-field magnetostriction measurements and numerical calculations. When a magnetic fi…
View article: Emergent quantum disordered phase in Na$_2$Co$_2$TeO$_6$ under intermediate magnetic field along $c$ axis
Emergent quantum disordered phase in Na$_2$Co$_2$TeO$_6$ under intermediate magnetic field along $c$ axis Open
Identifying the exotic quantum spin liquid phase in Kitaev magnets has garnered great research interests and remains a significant challenge. In experiments, most of the proposed candidate materials exhibit an antiferromagnetic (AFM) order…
View article: High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu<sub>2</sub>IrO<sub>3</sub>
High-temperature magnetic anomaly via suppression of antisite disorder through synthesis route modification in a Kitaev candidate Cu<sub>2</sub>IrO<sub>3</sub> Open
By incorporating inert KCl into the Na 2 IrO 3 + 2CuCl → Cu 2 IrO 3 + 2NaCl topochemical reaction, we significantly reduced the synthesis temperature of Cu 2 IrO 3 from the 350 °C reported in previous studies to 170 °C. This adjustment dec…
View article: Geometric frustration and Dzyaloshinskii-Moriya interactions in a quantum star lattice hybrid copper sulfate
Geometric frustration and Dzyaloshinskii-Moriya interactions in a quantum star lattice hybrid copper sulfate Open
We study the magnetism of a layered, spin-$\\frac12$ organic-inorganic copper\nsulfate, which is a close realization of the star lattice antiferromagnet, one\nof the playgrounds of geometric frustration and resonating valence bond physics\…
View article: Giant Linear Dichroism Controlled by Magnetic Field in FePS$_3$
Giant Linear Dichroism Controlled by Magnetic Field in FePS$_3$ Open
Magnetic-field control of fundamental optical properties is a crucial challenge in the engineering of multifunctional microdevices. Van der Waals (vdW) magnets retaining a magnetic order even in atomically thin layers, offer a promising pl…
View article: Quantum spin state stabilized by coupling with classical spins
Quantum spin state stabilized by coupling with classical spins Open
We introduce a model compound featuring a spin-1/2 frustrated square lattice\npartially coupled by spin-5/2. A significant magnetization plateau exceeding 60\nT could be observed, indicating a quantum state formed by $S$ = 1/2 spins in\nth…
View article: Quantum liquid states of spin solitons in a ferroelectric spin-Peierls state
Quantum liquid states of spin solitons in a ferroelectric spin-Peierls state Open
In this study, we performed high-magnetic-field magnetization, dielectric, and ultrasound measurements on an organic salt showing a ferroelectric spin-Peierls (FSP) state, which is in close proximity to a quantum critical point. In contras…
View article: Pseudogap formation in organic superconductors
Pseudogap formation in organic superconductors Open
The condensation of paired fermions into superfluid states changes progressively depending on the coupling strength. At the midpoint of the crossover between Bardeen--Cooper--Schrieffer (BCS) weak-coupling and Bose--Einstein condensate (BE…
View article: Rhenium oxyhalides: a showcase for anisotropic-triangular-lattice quantum antiferromagnets
Rhenium oxyhalides: a showcase for anisotropic-triangular-lattice quantum antiferromagnets Open
The spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice (ATL) is an archetypal spin system hosting exotic quantum magnetism and dimensional crossover. However, the progress in experimental research on this field has be…
View article: Field-induced quantum phase in a frustrated zigzag-square lattice
Field-induced quantum phase in a frustrated zigzag-square lattice Open
This study presents the experimental realization of a spin-1/2 zigzag-square\nlattice in a verdazyl-based complex, namely\n($m$-Py-V-2,6-F$_2$)$[$Cu(hfac)$_2]$. Molecular orbital calculations suggest\nthe presence of five types of frustrat…
View article: CCDC 2152328: Experimental Crystal Structure Determination
CCDC 2152328: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2152327: Experimental Crystal Structure Determination
CCDC 2152327: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2191226: Experimental Crystal Structure Determination
CCDC 2191226: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2191191: Experimental Crystal Structure Determination
CCDC 2191191: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2191199: Experimental Crystal Structure Determination
CCDC 2191199: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2191225: Experimental Crystal Structure Determination
CCDC 2191225: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2191212: Experimental Crystal Structure Determination
CCDC 2191212: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2191267: Experimental Crystal Structure Determination
CCDC 2191267: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …