RIKEN Center for Emergent Matter Science Strong Correlation Materials Research Group

Group Director: Yasujiro Taguchi (D.Eng.)

Japanese Page

Research Summary

We aim to study strongly correlated electron systems, such as transition-metal alloys, oxides and chalcogenides that show gigantic cross-correlation response. Specifically, we try to explore new materials, including skyrmion-hosting materials, multiferroic, thermoelectric, and superconducting materials, by using various materials synthesis techniques such as high pressure synthesis technique. Also, we focus on the correlation between the spin state and charge dynamics.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Interdisciplinary Science & Engineering
Engineering

Keywords

magnetism
multiferroics
skyrmion
thermoelectrics
superconductors

Selected Publications

1. K. Karube, L. C. Peng, J. Masell, X. Z. Yu, F. Kagawa, Y. Tokura, and Y. Taguchi,
"Room-temperature antiskyrmions and sawtooth surface textures in a non-centrosymmetric magnet with S₄ symmetry",
Nature Materials 20, 335 (2021).
2. M. Kriener, M. Sakano, M. Kamitani, M. S. Bahramy, R. Yukawa, K. Horiba, H. Kumigashira, K. Ishizaka, Y. Tokura, and Y. Taguchi,
"Evolution of Electronic States and Emergence of Superconductivity in the Polar Semiconductor GeTe by Doping Valence-Skipping Indium",
Physical Review Letters 124, 047002 (2020).
3. A. Doi, S. Shimano, D. Inoue, T. Kikitsu, T. Hirai, D. Hashizume, Y. Tokura, and Y. Taguchi,
"Band engineering carrier density control and enhanced thermoelectric performance in multi-doped SnTe",
APL Materials 7, 091107 (2019).
4. V. Kocsis, T. Nakajima, M. Matsuda, A. Kikkawa, Y. Kaneko, J. Takashima, K. Kakurai, T. Arima, F. Kagawa, Y. Tokunaga, Y. Tokura, and Y. Taguchi,
"Magnetization-polarization cross-control near room temperature in hexaferrite single Crystals",
Nature Communications 10, 1247 (2019).
5. K. Karube, J. S. White, D. Morikawa, C. D. Dewhurst, R. Cubitt, A. Kikkawa, X. Z. Yu, Y. Tokunaga, T.-h. Arima, H. M. Rønnow, Y. Tokura, and Y. Taguchi,
"Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet",
Science Advances 4, aar7043 (2018).
6. S. Shimano, Y. Tokura, and Y. Taguchi,
"Carrier density control and enhanced thermoelectric performance of Bi and Cu co-doped GeTe",
APL Materials 5, 056103 (2017).
7. K. Karube, J. S. White, N. Reynolds, J. L. Gavilano, H. Oike, A. Kikkawa, F. Kagawa, Y. Tokunaga, H. M. Rønnow, Y. Tokura, and Y. Taguchi,
"Robust metastable skyrmions and their triangular-square lattice-structural transition in a high-temperature chiral magnet",
Nature Materials 15, 1237 (2016).
8. M. Kriener, T. Nakajima, Y. Kaneko, A. Kikkawa, X. Z. Yu, N. Endo, K. Kato, M. Takata, T. Arima, Y. Tokura, and Y. Taguchi,
"Heat-treatment-induced switching of magnetic states in the doped polar semiconductor Ge_1-xMn_xTe",
Scientific Report .6, 25748 (2016).
9. Y. Tokunaga, X. Z. Yu, J. S. White, H. M. Rønnow, D. Morikawa, Y. Taguchi, and Y. Tokura,
"A new class of chiral materials hosting magnetic skyrmions beyond room temperature",
Nature Communications 6, 7638 (2015).
10. D. Choudhury, T. Suzuki, Y. Tokura, and Y. Taguchi,
"Tuning structural instability toward enhanced magnetocaloric effect around room temperature in MnCo_1-xZn_xGe",
Scientific Reports 4, 7544-1 - 7544-6, (2014).