Pressure-induced suppression of Jahn–Teller distortions and enhanced electronic properties in high-entropy oxide (Mg_0.2Ni_0.2Co_0.2Zn_0.2Cu_0.2)O

Jahn–Teller distortions are often observed in CuII-containing complex oxides resulting remarkable changes of physical properties. Tuning the with pressure has attracted considerable interest but is less studied high-entropy (HEOs). We found that can suppress structural originating from effect CuO6 octahedra rock salt-type (Mg0.2Ni0.2Co0.2Zn0.2Cu0.2)O HEO and significantly modify its electronic Synchrotron x-ray diffraction shows arising progressively suppressed, distorted structure evolves into a nearly ideal form under compression. Alternating current impedance ultraviolet-visible absorption measurements reveal dramatic resistance drop by more than three orders magnitude an obvious bandgap decrease ?0.1 eV, respectively, accompanied pressure-induced suppression distortions. Our study presents promising route for tuning structures HEOs optimizing materials functionalities.