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 magnetocaloric 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
magnetocalorics

Selected Publications

1.Kriener, M., Nakajima, T., Kaneko, Y., Kikkawa, A., Hashizume, D., Kato, K., Takata, M., Arima, T., Tokura, Y., and Taguchi, Y.:
"Enhanced ferromagnetic transition temperature induced by a microscopic structural rearrangement in the diluted magnetic semiconductor Ge1-xMnxTe",
Phys. Rev. B 95, 224418 (2017).
2.Shimano, S., Tokura, Y., and Taguchi, Y.:
"Carrier density control and enhanced thermoelectric performance of Bi and Cu co-doped GeTe",
APL Materials 5, 056103 (2017).
3.Karube, K., White, J.S., Reynolds, N., Gavilano, J.L., Oike, H., Kikkawa, A., Kagawa, F., Tokunaga, Y., Rønnow, H.M., Tokura, Y., and Taguchi, Y.:
"Robust metastable skyrmions and their triangular-square lattice-structural transition in a high-temperature chiral magnet",
Nature Mater. 15, 1237 (2016).
4.Kriener, M., Nakajima, T., Kaneko, Y., Kikkawa, A., Yu, X. Z., Endo, N., Kato, K., Takata, M., Arima, T., Tokura, Y., and Taguchi, Y.:
"Heat-treatment-induced switching of magnetic states in the doped polar semiconductor Ge1-xMnxTe",
Scientific Report .6, 25748 (2016).
5.Suzuki, T., Kikkawa, A., Tokura, Y., and Taguchi, Y.:
"Impact of electron doping on thermoelectric properties in filled skutterudite IrSb3",
Phys. Rev. B 93, 155101 (2015)
6.Tokunaga, Y., Yu, X.Z., White, J.S., Ronnow, H. M., Morikawa, D., Taguchi, Y., and Tokura Y.:
"A new class of chiral materials hosting magnetic skyrmions beyond room temperature"
Nature Communications 6, 7638 (2015)
7.Kriener, M., Kikkawa, A., Suzuki, T., Akashi, R., Arita, R., Tokura, Y. and Taguchi, Y.:
"Modification of the electronic structure and thermoelectric properties of hole-doped tungsten dichalcogenides"
Phys. Rev. B 91, 075205 (2015)
8.Tokunaga, Y., Taguchi, Y., Arima, T., and Tokura, Y.:
"Magnetic biasing of a ferroelectric hysteresis loop in a multiferroic orthoferrite"
Phys. Rev. Lett. 112, 037203 (2014)
9.Choudhury, D., Suzuki, T., Tokura, Y., and Taguchi, Y.:
"Tuning structural instability toward enhanced magnetocaloric effect around room temperature in MnCo1-xZnxGe"
Scientific Reports 4, 7544-1 — 7544-6, (2014)
10.Tokunaga, Y., Taguchi, Y., Arima, T., and Tokura, Y.:
"Electric field induced generation and reversal of ferromagnetic moment in ferrites"
Nature Physics 8, 838-844 (2012)