Single crystal growth by self-flux method of the mixed valence gold halides Cs₂[Au^{I}X₂][Au^{III}X₄] (X=Br,I)

Scott C. Riggs , M. C. Shapiro , F. Corredor , T. H. Geballe , I. R. Fisher , Gregory T. McCandless , Julia Y. Chan

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classification ❄️ cond-mat.mtrl-sci

keywords singlecrystalmeasurementsmethodself-fluxattemptsbandgapbelonging

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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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Single crystal growth by self-flux method of the mixed valence gold halides Cs₂[Au^{I}X₂][Au^{III}X₄] (X=Br,I)

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