Metastable Cu$_{1-x}$CrTe$_2$ -- Completing the copper chromium delafossite series through soft chemistry
In the layered copper chromium dichalcogenide series CuCr$X_2$, the oxide, the sulfide, and the selenide analogues have been reported, but the telluride CuCrTe$_2$ has remained unsynthesized so far. Here, we report the synthesis of Cu$_{1-x}$CrTe$_2$ ($x \approx 0.3$), which forms only within a narrow temperature window near 90 °C by solvothermal cation exchange of K$_{1-x}$CrTe$_2$ ($x \approx 0.3$) and CuBr. Cu$_{1-x}$CrTe$_2$ undergoes a magnetostructural transition to an antiferromagnetic state at $T_\mathrm{N}=239$ K, a Néel temperature that is high relative to other $A$CrTe$_2$ phases and comparable to that of ferromagnetic, fully-deintercalated CrTe$_2$. Cu$_{1-x}$CrTe$_2$ is metastable and decomposes at temperatures as low as 250 °C to form spinel CuCr$_2$Te$_4$. These results highlight the importance of low-temperature topochemical routes for accessing metastable Cu(I)-containing tellurides that are inaccessible by conventional solid-state synthesis.