Synthesis and Properties of Charge-Ordered Thallium Halide Perovskites, CsTl+0.5Tl3+0.5X3 (X = F or Cl): Theoretical Precursors for Superconductivity?
/ Authors
M. Retuerto, T. Emge, J. Hadermann, Peter W. Stephens, Manrong Li, Zhiping Yin, M. Croft, A. Ignatov, S. Zhang, Z. Yuan
and 7 more authors
Changqing Jin, J. Simonson, Meigan Aronson, A. Pan, D. Basov, G. Kotliar, M. Greenblatt
/ Abstract
Recently, CsTlCl3 and CsTlF3 perovskites were theoretically predicted to be potential superconductors if they were optimally doped. The syntheses of these two compounds together with a complete characterization of the samples are reported. CsTlCl3 was obtained as orange crystals in two different polymorphs: a tetragonal phase (I4/m) and a cubic phase (Fm3m). CsTlF3 was formed as a light brown powder, and also as a double cubic perovskite (Fm3m). In all three CsTlX3 phases, Tl+ and Tl3+ were located in two different crystallographic positions that accommodate their different bond lengths. In CsTlCl3, some Tl vacancies were found in the Tl+ position. The charge ordering between Tl+ and Tl3+ was confirmed by X-ray absorption and Raman spectroscopy. The Raman spectroscopy of CsTlCl3 at high pressure (58 GPa) did not indicate any phase transition to a possible single Tl2+ state. However, the highly insulating material became less resistive with an increasing high pressure, while it underwent a change in its ...
Journal: Chemistry of Materials
DOI: 10.1021/cm402423x