Research

　Here is an overview of my research.

Frustrated magnetism, Quantum spin systems

1. Diverse magnetic-field-versus–temperature phase diagrams in breathing pyrochlore magnets


2. Theoretical study of the effects of spin–lattice coupling in various geometrical frustrated magnets


3. Introducing an extended spin–lattice coupling model with application to thermodynamic properties


4. Evaluating the spin model of 5d transition-metal–based anisotropic triangular-lattice antiferromagnets

Helimagnetism, Skyrmion

1. Discovery of incommensurate helical magnetic order in breathing pyrochlore lattice magnets


2. Revisiting a double-Q broken-helix state in an axion-insulator candidate


3. Orthorhombic distortion and uniaxial-stress control of the magnetic phase diagram in a skyrmion-host tetragonal itinerant magnet


4. Cubic magnetic anisotropy in a perovskite iron oxide hosting a hedgehog-lattice phase

Nonperturbative magnetic-field effects on orbital and charge degress of freedom

1. Ligand-hole state and magnetic-field-induced valence transition in a perovskite iron oxide


2. Magnetic-field-induced Jahn-Teller transition from antipolar to polar order

Developments of experimental techniques, Unique experiments

1. Magnetization measurements by the inductive method under ultrahigh magnetic fields above 150 T


2. Multi-axis dilatometry using the fiber Bragg grating (FBG) method


3. Single-shot powder X-ray diffraction in pulsed high magnetic fields using a portable single-turn-coil system

Others

1. Paschen-Back effect in the photoluminescence spectrum of ruby in ultrahigh magnetic fields


2. Enhancement of giant magnetoelectric effect by chemical substitution in a polar ferrimagnet


3. Observation of crystal-field magnetostriction in a spin-ice compound