K. Morita

activity

20082023

most citedPinwheel VBS state and triplet excitations in the two-dimensional deformed kagome lattice

123 citations · 553 across the 24 of their papers we have counts for

collaborators

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24 papers · 1 filter

cond-mat.str-el2023★ 10 cited

Stability of the 1/3 magnetization plateau of the $J_{1} - J_{2}$ kagome Heisenberg model

Katsuhiro Morita

In this study, we investigate the finite-temperature properties of the spin-1/2 $J_{1} - J_{2}$ Heisenberg model on the kagome lattice using the orthogonalized finite-temperature Lanczos…

cond-mat.str-el2022

Gapless chirality liquid with symmetry-protected edge spins

Shunsuke C. Furuya, Katsuhiro Morita

We report that a spin-1/2 tetrahedral Heisenberg chain realizes a gapless symmetry-protected topological (gSPT) phase characterized by the coexistence of the Tomonaga-Luttinger-liq…

cond-mat.str-el2021

Effects of bond-randomness and Dzyaloshinskii-Moriya interactions on the specific heat at low temperatures of a spherical kagomé cluster in {W $_{72}$ V $_{30}$ }

Mikio Motohashi, Kouki Inoue, Katsuhiro Morita +2

For the spin-1/2 spherical kagomé cluster, as well as for the 2D kagomé lattice, many low-energy singlet excitations have been expected to exist in the energy region below the spin…

cond-mat.str-el2021★ 7 cited

Isothermal and adiabatic magnetization processes of the spin- $\frac{1}{2}$ Heisenberg model on an anisotropic triangular lattice

Katsuhiro Morita

In this study, we investigate the magnetic susceptibility, entropy, and isothermal magnetization curve of the spin-1/2 Heisenberg model on an anisotropic triangular lattice using t…

cond-mat.str-el2021★ 7 cited

Magnetic phase diagrams of the spin- $\frac{1}{2}$ Heisenberg model on a kagome-strip chain: Emergence of a Haldane phase

Katsuhiro Morita, Shigetoshi Sota, Takami Tohyama

Frustrated one-dimensional quantum spin systems are known to exhibit a variety of quantum ground states due to the effects of quantum fluctuations and frustrations. In a spin-1/2 k…

cond-mat.str-el2020★ 10 cited

Resonating dimer-monomer liquid state in a magnetization plateau of a spin- $\frac{1}{2}$ kagome-strip Heisenberg chain

Katsuhiro Morita, Shigetoshi Sota, Takami Tohyama

Highly frustrated spin systems such as the kagome lattice (KL) are a treasure trove of new quantum states with large entanglements. We thus study the spin- $\frac{1}{2}$ Heisenberg…

cond-mat.str-el2019★ 19 cited

Vanishing Wilson ratio as the hallmark of quantum spin-liquid models

P. Prelovšek, K. Morita, T. Tohyama +1

We present numerical results for finite-temperature $T > 0$ thermodynamic quantities, entropy $s (T)$ , uniform susceptibility $χ_{0} (T)$ and the Wilson ratio $R (T)$ , for several isotrop…

cond-mat.str-el2019★ 34 cited

Magnetic orders induced by RKKY interaction in Tsai-type quasicrystalline approximant Au-Al-Gd

Haruka Miyazaki, Takanori Sugimoto, Katsuhiro Morita +1

Recent experimental study on Tsai-type quasicrystalline approximant Au-Al-Gd has revealed the presence of magnetic orders and phase transitions with changing the Au/Al concentratio…

cond-mat.str-el2019★ 39 cited

Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

Katsuhiro Morita, Takami Tohyama

Frustrated quantum spin systems such as the Heisenberg and Kitaev models on various lattices, have been known to exhibit various exotic properties not only at zero temperature but…

cond-mat.str-el2019★ 12 cited

Magnetization plateau and supersolid phases in the spin-1/2 antiferromagnetic Heisenberg model on a tetragonally distorted fcc lattice

Katsuhiro Morita, Takami Tohyama

The Heisenberg model on a face center cubic (fcc) lattice is a typical three-dimensional frustrated spin system expected to have magnetization plateaus and supersolid phases. There…

cond-mat.str-el2018★ 20 cited

Ground-state phase diagram of the Kitaev-Heisenberg model on a kagome lattice

Katsuhiro Morita, Masanori Kishimoto, Takami Tohyama

The Kitaev-Heisenberg model on the honeycomb lattice has been studied for the purpose of finding exotic states such as quantum spin liquid and topological orders. On the kagome lat…

cond-mat.str-el2018★ 9 cited

Cluster-Based Haldane States in Spin-1/2 Cluster Chains

Takanori Sugimoto, Katsuhiro Morita, Takami Tohyama

The Haldane state is a typical quantum and topological state of matter, which exhibits an edge state corresponding to symmetry-protected topological order in a one-dimensional inte…

cond-mat.str-el2018★ 15 cited

Ground state phase diagram of Kitaev-Heisenberg model on honeycomb-triangular lattice

Masanori Kishimoto, Katsuhiro Morita, Yukihiro Matsubayashi +3

The Kitaev-Heisenberg model defined on both honeycomb and triangular lattices has been studied intensively in recent years as a possible model to describe spin-orbital physics in i…

cond-mat.str-el2018★ 27 cited

Magnetic phase diagrams and magnetization plateaus of the spin-1/2 antiferromagnetic Heisenberg model on square-kagome lattice with three nonequivalent exchange interactions

Katsuhiro Morita, Takami Tohyama

Magnetization plateaus in quantum spin systems emerges in two-dimensional frustrated systems such as kagome lattice. The spin-1/2 antiferromagnetic Heisenberg model on square-kagom…

cond-mat.str-el2017★ 18 cited

Magnetization plateaus in the spin-1/2 antiferromagnetic Heisenberg model on a kagome-strip chain

K. Morita, T. Sugimoto, S. Sota +1

Spin-1/2 Heisenberg model on kagome lattice is a typical frustrated quantum spin system. A basic structure of kagome lattice is also present in kagome-strip lattice in one dimensio…

cond-mat.str-el2017★ 27 cited

Tomonaga-Luttinger spin liquid in the spin-1/2 inequilateral diamond-chain compound K $_{3}$ Cu $_{3}$ AlO $_{2}$ (SO $_{4}$ ) $_{4}$

M. Fujihala, H. Koorikawa, S. Mitsuda +14

K $_{3}$ Cu $_{3}$ AlO $_{2}$ (SO $_{4}$ ) $_{4}$ is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in…

cond-mat.str-el2017★ 25 cited

Static and Dynamic Magnetic Properties of Spin-1/2 Inequilateral Diamond-Chain Compounds $A_{3}$ Cu $_{3}$ AlO $_{2}$ (SO $_{4}$ ) $_{4}$ ( $A$ =K, Rb, and Cs)

Katsuhiro Morita, Masayoshi Fujihala, Hiroko Koorikawa +4

Spin-1/2 compounds A3Cu3AlO2(SO4)4 (A=K, Rb, and Cs) have one-dimensional (1D) inequilateral diamond chains. We analyze the temperature dependence of the magnetic susceptibility an…

cond-mat.str-el2016★ 16 cited

Multiple Magnetization Plateaus and the Magnetic Structures in $S = 1/2$ Heisenberg Model on the Checkerboard Lattice

Katsuhiro Morita, Naokazu Shibata

We study the ground state of $S = 1/2$ Heisenberg model on the checkerboard lattice in a magnetic field by the density matrix renormalization group (DMRG) method with the sine-squa…

cond-mat.str-el2016★ 13 cited

Field Induced Quantum Phase Transitions in $S = 1/2$ $J_{1}$ - $J_{2}$ Heisenberg Model on the Square Lattice

Katsuhiro Morita, Naokazu Shibata

We study the magnetic field dependence of the ground state of $S = 1/2$ $J_{1}$ - $J_{2}$ Heisenberg model on the square lattice by the DMRG method with the sine-square deformation. We obt…

cond-mat.str-el2010★ 123 cited

Pinwheel VBS state and triplet excitations in the two-dimensional deformed kagome lattice

K. Matan, T. Ono, Y. Fukumoto +5

Determining ground states of correlated electron systems is fundamental to understanding novel phenomena in condensed matter physics. A difficulty, however, arises in a geometrical…

cond-mat.str-el2009★ 12 cited

Partial ferromagnetic ordering and indirect exchange interaction in spatially anisotropic kagome antiferromagnet Cs_2Cu_3CeF_{12}

T. Amemiya, M. Yano, K. Morita +5

We report the crystal structure and unconventional magnetic ordering of Cs_2Cu_3CeF_{12}, which is composed of buckled kagome lattice of Cu^{2+} ions. The exchange network in the b…

cond-mat.str-el2009★ 54 cited

Magnetic susceptibilities in a family of S=1/2 Kagome antiferromagnet

T. Ono, K. Morita, M. Yano +5

Hexagonal antiferromagnets Cs $_{2}$ Cu $_{3}$ MF $_{12}$ (M = Zr, Hf and Sn) have uniform Kagome lattices of Cu $^{2 +}$ with S = 1/2, whereas Rb $_{2}$ Cu $_{3}$ SnF $_{12}$ has a 2a by 2a enlarged…

cond-mat.str-el2008★ 1 cited

New S=1/2 Kagome Antiferromagnets A $_{2}$ Cu $_{3}$ SnF $_{12}$ : A=Cs and Rb

T. Ono, K. Morita, M. Yano +5

We synthesized single crystals of the new hexagonal compounds A $_{2}$ Cu $_{3}$ SnF $_{12}$ with A=Cs and Rb, and investigated their magnetic properties. These compounds are composed of Ka…

cond-mat.str-el2008★ 55 cited

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb $_{2}$ Cu $_{3}$ SnF $_{12}$

K. Morita, M. Yano, T. Ono +5

We investigated the crystal structure of Rb $_{2}$ Cu $_{3}$ SnF $_{12}$ and its magnetic properties using single crystals. This compound is composed of Kagome layers of corner-sharing CuF$…

Stability of the 1/3 magnetization plateau of the J1​−J2​ kagome Heisenberg model

Gapless chirality liquid with symmetry-protected edge spins

Effects of bond-randomness and Dzyaloshinskii-Moriya interactions on the specific heat at low temperatures of a spherical kagomé cluster in {W72​V30​}

Isothermal and adiabatic magnetization processes of the spin-21​ Heisenberg model on an anisotropic triangular lattice

Magnetic phase diagrams of the spin-21​ Heisenberg model on a kagome-strip chain: Emergence of a Haldane phase

Resonating dimer-monomer liquid state in a magnetization plateau of a spin-21​ kagome-strip Heisenberg chain

Vanishing Wilson ratio as the hallmark of quantum spin-liquid models

Magnetic orders induced by RKKY interaction in Tsai-type quasicrystalline approximant Au-Al-Gd

Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

Magnetization plateau and supersolid phases in the spin-1/2 antiferromagnetic Heisenberg model on a tetragonally distorted fcc lattice

Ground-state phase diagram of the Kitaev-Heisenberg model on a kagome lattice

Cluster-Based Haldane States in Spin-1/2 Cluster Chains

Ground state phase diagram of Kitaev-Heisenberg model on honeycomb-triangular lattice

Magnetic phase diagrams and magnetization plateaus of the spin-1/2 antiferromagnetic Heisenberg model on square-kagome lattice with three nonequivalent exchange interactions

Magnetization plateaus in the spin-1/2 antiferromagnetic Heisenberg model on a kagome-strip chain

Tomonaga-Luttinger spin liquid in the spin-1/2 inequilateral diamond-chain compound K3​Cu3​AlO2​(SO4​)4​

Static and Dynamic Magnetic Properties of Spin-1/2 Inequilateral Diamond-Chain Compounds A3​Cu3​AlO2​(SO4​)4​ (A=K, Rb, and Cs)

Multiple Magnetization Plateaus and the Magnetic Structures in S=1/2 Heisenberg Model on the Checkerboard Lattice

Field Induced Quantum Phase Transitions in S=1/2 J1​-J2​ Heisenberg Model on the Square Lattice

Pinwheel VBS state and triplet excitations in the two-dimensional deformed kagome lattice

Partial ferromagnetic ordering and indirect exchange interaction in spatially anisotropic kagome antiferromagnet Cs_2Cu_3CeF_{12}

Magnetic susceptibilities in a family of S=1/2 Kagome antiferromagnet

New S=1/2 Kagome Antiferromagnets A2​Cu3​SnF12​: A=Cs and Rb

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb2​Cu3​SnF12​

Stability of the 1/3 magnetization plateau of the $J_{1} - J_{2}$ kagome Heisenberg model

Effects of bond-randomness and Dzyaloshinskii-Moriya interactions on the specific heat at low temperatures of a spherical kagomé cluster in {W $_{72}$ V $_{30}$ }

Isothermal and adiabatic magnetization processes of the spin- $\frac{1}{2}$ Heisenberg model on an anisotropic triangular lattice

Magnetic phase diagrams of the spin- $\frac{1}{2}$ Heisenberg model on a kagome-strip chain: Emergence of a Haldane phase

Resonating dimer-monomer liquid state in a magnetization plateau of a spin- $\frac{1}{2}$ kagome-strip Heisenberg chain

Tomonaga-Luttinger spin liquid in the spin-1/2 inequilateral diamond-chain compound K $_{3}$ Cu $_{3}$ AlO $_{2}$ (SO $_{4}$ ) $_{4}$

Static and Dynamic Magnetic Properties of Spin-1/2 Inequilateral Diamond-Chain Compounds $A_{3}$ Cu $_{3}$ AlO $_{2}$ (SO $_{4}$ ) $_{4}$ ( $A$ =K, Rb, and Cs)

Multiple Magnetization Plateaus and the Magnetic Structures in $S = 1/2$ Heisenberg Model on the Checkerboard Lattice

Field Induced Quantum Phase Transitions in $S = 1/2$ $J_{1}$ - $J_{2}$ Heisenberg Model on the Square Lattice

New S=1/2 Kagome Antiferromagnets A $_{2}$ Cu $_{3}$ SnF $_{12}$ : A=Cs and Rb

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb $_{2}$ Cu $_{3}$ SnF $_{12}$