High-pressure effect

High-pressure studies on multiple strongly correlated electron systems

The competition and correlation between structural, electronic, charge, and spin orderings have attracted significant research interest in the realm of condensed-matter physics. Recently, we utilized the external physical pressure effect to further probe the local crystal structure and the nature of the anomalous phase transition in Weyl-semimetal Co3Sn2S2 [1], chiral skyrmion Cu2OSeO3 [2], honeycomb-lattice Mn2V2O7 [3], superconductivity CuIr2Te4 [4], and multiple-piezomagnetism Cu2OSeO3-HP (high-pressure phase) [5]. We highlighted the important findings: (1) Observation of low-field induced anomalous phase in Co3Sn2S2. (2) Pressure-induced structural transition and room-temperature skyrmion phase in Cu2OSeO3. (3) A unique multifunctional material with the coexistence of ferroelasticity and antiferromagnetism in Mn2V2O7. (4) The anomalous phase transition near 250 K in CuIr2Te4 is structural rather than a charge-density-wave formation. (5) Observation of thermally induced piezomagnetic switching in Cu2OSeO3 polymorph synthesized under high-pressure.

References:

[1] H. C. Wu et al., Mater. Today Phys. 12, 100189 (2020)

[2] L. Z. Deng# and H. C. Wu# et al., PNAS 117, 8783 (2020) (Co-first author)

[3] H. C. Wu* et al., Phys. Rev. B 102, 075130 (2020) (Corresponding author)

[4] H. C. Wu* et al., Phys. Rev. B 103, 104111 (2021) (Corresponding author)

[5] H. C. Wu* et al., Adv. Physics Res. 3, 2400054 (2024) (Corresponding author)