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Red Shift in Optical Excitations on Layered Copper Perovskites under Pressure: Role of the Orthorhombic Instability
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2022-11-02 , DOI: 10.1002/chem.202202933
David Carrasco-Busturia 1 , Inés Sánchez-Movellán 2 , Alexander Sougaard Tygesen 1 , Arghya Bhowmik 1 , Juan María García-Lastra 1 , José Antonio Aramburu 2 , Miguel Moreno 2
Affiliation  

By first principles calculations, the behaviour under pressure of the structure and optical transitions of (C2H5NH3)CdCl4:Cu2+ layered system versus two Jahn-Teller (JT) systems, CdCl2:Cu2+ and NaCl:Cu2+ is explored. The last two systems come from a parent phase where CuCl64− complexes have orbital degeneracy and thus suffer a JT instability. In contrast, there is no degeneracy in the parent phase of the layered system, which undergoes an orthorhombic instability connected with the red shift under pressure.

中文翻译:

压力下层状铜钙钛矿光激发的红移:正交不稳定性的作用

通过第一性原理计算,(C 2 H 5 NH 3 )CdCl 4 :Cu 2+分层系统与两个 Jahn-Teller (JT) 系统、CdCl 2 :Cu 2+和 NaCl的结构和光学跃迁在压力下的行为:探索了Cu 2+ 。最后两个系统来自母相,其中 CuCl 6 4−复合物具有轨道简并,因此遭受 JT 不稳定性。相反,层状系统的母相没有简并,它经历了与压力下红移相关的正交不稳定性。
更新日期:2022-11-02
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