arXiv subjects

Kunio Tokushuku

Publications and source records attributed to Kunio Tokushuku.

4 recordsLinked to original sources

arXiv2021

Magnetic Switching by Oxygen Adsorption in Metal-Organic Framework Systems

In this letter, we address magnetization switching by oxygen adsorption in porous metal-organic framework systems. To this end, we construct a simple localized spin model combined with a Langmuir-type formula for oxygen adsorption and study its finite-temperature properties using Monte Carlo simulation. We successfully explain the main features of this phenomenon, such as the discontinuous changes in magnetic states, sensitivity of the magnetic transition temperatures to oxygen pressure, and absence of singularities in adsorbed oxygen. Based on this model, we also reproduce the observed magnetic transition temperatures for a typical value of oxygen adsorption energy.

cond-mat.mtrl-sci↗

arXiv2020

Field-selective classical spin liquid and magnetization plateaus on kagome lattice

We obtain a classical spin liquid (CSL) phase by applying a magnetic field in $J_1$-$J_2$-$J_3$ Ising model on a kagome lattice. As we proved in the previous study [Phys. Rev. Lett. {\bf 119}, 077207 (2017)], this model realizes one species of CSL, the hexamer CSL, at zero magnetic field, which consists of macroscopically degenerate spin configurations with mixed total magnetization, $M$. The magnetic field selects its subset, which can be mapped to a trimer covering of the dual lattice, and forms a magnetization plateau of $M=1/9$. In addition to this CSL, we find two other magnetization plateaus at $M=5/9$ and $17/27$, which are ascribed to the "multimer" superstructures on a dual lattice.

cond-mat.str-el↗

arXiv2019

Trimer classical spin liquid from interacting fractional charges

We study a problem of interacting fractional charges with $J_1$-$J_2$-$J_3$ Ising model on a checkerboard lattice under magnetic field. As a result of the interplay between repulsive interactions and particle density tuning by magnetic field, the fractional charges form a classical spin liquid (CSL) phase. The CSL phase is composed of degenerate spin configurations, which can be mapped to the trimer covering of dual square lattice. The CSL state shows macroscopic ground-state entropy, implying the emergence of novel quantum spin liquid phase when quantum fluctuations are turned on. In addition to the CSL phase, the system exhibits multiple magnetization plateaus, reflecting the fertile screening processes of dimer-monomer mixtures.

cond-mat.str-el↗

arXiv2018

Tunable spin dynamics in chiral soliton lattice

We study dynamics of a chiral soliton lattice (CSL) in a classical one-dimensional spin chain coupled to the conduction electrons under an electric field. The CSL has attracted much interest because its period can be easily controlled by an external magnetic field. We clarify the dependence of the CSL dynamics on its period. A collective coordinate and an SU(2) gauge method are used for the analysis. It turns out that the velocity of the CSL becomes slower as the period becomes longer. We also mention a relation between the velocity and the magnetic resistance.

cond-mat.mes-hall↗