Abstract
This work investigates the optical spectra of Cu(II) layered perovskites under pressure. The aim is to establish correlations between the metal-to-ligand charge transfer spectra and the local structure around the Cu(II). For this purpose, X-ray diffraction (XRD) and X-ray absorption (XAS) experiments on the title compounds were performed as a function of pressure in the 0-100 kbar range The pressure redshift experienced by the first charge transfer band correlates with a reduction of the Janh-Teller (JT) distortion of the hexachloride Cu(II) complex. Interestingly, the application of pressure to these layer compounds induces octahedron tilts rather than a reduction of the in-plane antiferrodistortive structure related to the cooperative JT structure. This reflects the stiffness of the JT Cu complex whose local bulk modulus is an order of magnitude greater than the crystal bulk modulus
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Rodríguez, F., Hanfland, M., Itié, J.P., Polian, A. (2001). Optical properties of A2CuCl4 layer perovskites under pressure. Structural correlations. In: Hochheimer, H.D., Kuchta, B., Dorhout, P.K., Yarger, J.L. (eds) Frontiers of High Pressure Research II: Application of High Pressure to Low-Dimensional Novel Electronic Materials. NATO Science Series, vol 48. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0520-3_11
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DOI: https://doi.org/10.1007/978-94-010-0520-3_11
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