雅恩-泰勒效应
材料科学
八面体
凝聚态物理
带隙
结晶学
离子
光电子学
晶体结构
化学
物理
有机化学
作者
Jiejuan Yan,Lingkong Zhang,Junxiu Liu,Nana Li,Nobumichi Tamura,Bin Chen,Yu Lin,Wendy L. Mao,Hengzhong Zhang
摘要
Jahn–Teller distortions are often observed in CuII-containing complex oxides resulting in remarkable changes of physical properties. Tuning the Jahn–Teller distortions with pressure has attracted considerable interest but is less studied in CuII-containing high-entropy oxides (HEOs). We found that pressure can suppress the structural distortions originating from the Jahn–Teller effect of CuO6 octahedra in the rock salt-type (Mg0.2Ni0.2Co0.2Zn0.2Cu0.2)O HEO and significantly modify its electronic properties. Synchrotron x-ray diffraction shows that the structural distortions arising from the Jahn–Teller effect of CuO6 octahedra are progressively suppressed, and the distorted structure evolves into a nearly ideal form under compression. Alternating current impedance and ultraviolet-visible absorption measurements reveal a dramatic resistance drop by more than three orders of magnitude and an obvious bandgap decrease in ∼0.1 eV, respectively, accompanied by the pressure-induced suppression of structural distortions. Our study presents a promising route for tuning the structural distortions and the electronic structures of CuII-containing HEOs for optimizing materials functionalities.
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