Single crystal growth by self-flux method of the mixed valence gold halides Cs${}_2$[Au${}^I$X${}_2$][Au${}^{III}$X${}_4$] (X=Br,I)

Abstract

High quality single crystals of Cs${}_2$Au${}_2$X${}_6$ (X=Br,I) were grown using a ternary self-flux method. Structural refinements based on single crystal X-ray diffraction measurements show that both materials have a distorted perovskite structure belonging to the I4/mmm space group with full site occupancy. Transport measurements reveal a large bandgap of 550 $\pm$ 100 meV for Cs${}_2$Au${}_2$I${}_6$ and 520 $\pm$ 80 meV for Cs${}_2$Au${}_2$Br${}_6$. Initial attempts at chemical substitution are described.

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• Evidence for charge Kondo effect in superconducting Tl-doped PbTe
• Superconductivity in charge Kondo systems
• Evidence for a charge Kondo effect in Pb(1-x)Tl(x)Te from measurements of thermoelectric power

Cited by in corpus (4)

• Optoelectronic Properties and Defect Physics of Lead-free Photovoltaic Absorbers Cs${}_2$Au${}^I$Au${}^{III}$X${}_6$ (X=I, Br)
• Pressure-induced symmetry breaking in tetragonal CsAuI3
• Large Resistivity Reduction in Mixed-Valent CsAuBr${}_3$ Under Pressure
• Dielectric softening in the halide double perovskites $A_2$Au${}_2{X}_6$ ($A$: Cs, Rb; $X$: Cl, Br, I) via a strain-mediated pseudotriggered mechanism