@conference{10902/32981,
year = {2019},
url = {https://hdl.handle.net/10902/32981},
abstract = {We have investigated the crystal structure of Cs₂CuCl₄ in the 0-20 GPa range as a function of pressure and how pressure affects its electronic properties by means of optical
absorption spectroscopy. In particular, we focused on the electronic properties in the
low-pressure Pnma phase, which are mainly related to the tetrahedral CuCl²−₄ units distorted by the Jahn–Teller effect. This study provides a complete characterization of the
electronic structure of Cs₂CuCl₄ in the Pmna phase as a function of the cell volume and
the Cu–Cl bond length, RCu−Cl. Interestingly, the opposite shift of the charge-transfer
band-gap and the Cu2+ d-d crystal-field band shift with pressure are responsible for the
strong piezochromism of Cs₂CuCl₄. We have also explored the high-pressure structure
of Cs₂CuCl₄ above 4.9 GPa yielding structural transformations that are probably associated with a change of coordination around Cu²+. Since the high-pressure phase appears
largely amorphized, any structural information from X-ray diffraction is ruled out. We use
electronic probes to get structural information of the high-pressure phase.},
organization = {Financial support from the Spanish Ministerio de Economía, Industria y Competitividad (Project Ref. MAT2015-69508-P) and MALTA-CONSOLIDER (Ref. MAT2015-71010REDC). EJ also thanks the Spanish Ministerio de Ciencia, Innovación y Universidades for a FPI research grant (Ref. No. BES-2016-077449).},
publisher = {La Plata: S. A. Cannas},
publisher = {Papers in Physics, 2019, 11, 110004},
title = {Structural correlations in Cs₂CuCl₄: pressure dependence of electronic structures},
author = {Jara Martínez, Enrique and Barreda Argüeso, José Antonio and González Gómez, Jesús Antonio and Valiente Barroso, Rafael and Rodríguez González, Fernando},
}