RIKEN Center for Emergent Matter Science Strong Correlation Quantum Structure Research Group

Group Director: Takahisa Arima (Ph.D.)

Japanese Page

Research Summary

Strongly correlated electron systems may exhibit various interesting emergent phenomena such as superconductivity, colossal magneto-resistance, and giant magneto-electric effects. These emergent phenomena are directly associated with the spatial distributions as well as the spatial and temporal fluctuations of atoms, electron density, and spin density. We are going to perform crystallographic and magnetic structure analyses, spectroscopies, and microscopies by using synchrotron x-rays, neutrons, and high-energy electron beams to reveal them.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Interdisciplinary Science & Engineering

Keywords

x-ray
neutron
optical properties
multiferroics

Selected Publications

1. M. Gen, H. Ishikawa, A. Miyake, T. Yajima, H. O. Jeschke, H. Sagayama, A. Ikeda, Y. H. Matsuda, K. Kindo, M. Tokunaga, Y. Kohama, T. Kurumaji, Y. Tokunaga, T. Arima.:
"Breathing pyrochlore magnet CuGaCr4S8: Magnetic, thermodynamic, and dielectric properties"
Phys. Rev. Materials, 7, 104404 (2023)
2. S. Kitou, M. Gen, Y. Nakamura, K. Sugimoto, Y. Tokunaga, S. Ishiwata, T. Arima.:
"Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO3"
Adv. Sci., 10, 2302839 (2023)
3. M. Gen, R. Takagi, Y. Watanabe, S. Kitou, H. Sagayama, N. Matsuyama, Y. Kohama, A. Ikeda, Y. Onuki, T. Kurumaji, T. Arima, S. Seki.:
"Rhombic skyrmion lattice coupled with orthorhombic structural distortion in EuAl4"
Phys. Rev. B 107, L020410 (2023)
4. J. Ju, H. Saito, T. Kurumaji, M. Hirschberger, A. Kikkawa, Y. Taguchi, T. Arima, Y. Tokura, T. Nakajima.:
"Polarized neutron scattering study of the centrosymmetric skyrmion host material Gd2PdSi3"
Phys. Rev. B 107, 024405 (2023)
5. V. Ukleev, O. Utesov, L. Yu, C. Luo, K. Chen, F. Radu, Y. Yamasaki, N. Kanazawa, Y. Tokura, T. Arima, J. S. White.:
"Signature of anisotropic exchange interaction revealed by vector-field control of the helical order in a FeGe thin plate"
Phys. Rev. Research 3, 013094 (2021)
6. T. Nakajima, T. Oda, M. Hino, H. Endo, K. Ohishi, K. Kakurai, A. Kikkawa, Y. Taguchi, Y. Tokura, T. Arima.:
"Crystallization of magnetic skyrmions in MnSi investigated by neutron spin echo spectroscopy"
Phys. Rev. Research 2, 043393 (2020)
7. V. Ukleev, Y. Yamasaki, O., Utesov, K. Shibata, N. Kanazawa, N. Jaouen, H. Nakao, Y. Tokura, T. Arima.:
"Metastable solitonic states in the strained itinerant helimagnet FeGe"
Phys. Rev. B 102, 014416 (2020)
8. S. Gao, D. Hirai, H. Sagayama, H. Ohsumi, Z. Hiroi, T. Arima.:
"Antiferromagnetic long-range order in the 5d1 double-perovskite Sr2MgReO6"
Phys. Rev. B 101, 220412R (2020)
9. Y. Ishii, K. Yamamoto, Y. Yokoyama, M. Mizumaki, H. Nakao, T. Arima, Y. Yamasaki.:
"Soft-X-ray Vortex Beam Detected by Inline Holography"
Phys. Rev. Appl. 14, 064069 (2020)
10. S. Gao, M. Hirschberger, O. Zaharko, T. Nakajima, T. Kurumaji, A. Kikkawa, J. Shiogai, A. Tsukazaki, S. Kimura, S. Awaji, Y. Taguchi, T. Arima, Y. Tokura.:
"Ordering phenomena of spin trimers accompanied by a large geometrical Hall effect"
Phys. Rev. B 100, 241115(R) (2019)