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The critical cooling rate $R_{\rm c}$ above which charge ordering iskinetically avoided upon cooling, which results in charge-glass formation, wasinvestigated for the geometrically frustrated system $\theta$-(BEDT-TTF)$_2X$.X-ray diffraction experiments revealed that$\theta$-(BEDT-TTF)$_2$TlCo(SCN)$_4$ exhibits a horizontally charge-orderedstate, and kinetic avoidance of this state requires rapid cooling of fasterthan 150 K/min. This value is markedly higher than that reported for two otherisostructural $\theta$-type compounds, thus demonstrating the lowercharge-glass-forming ability of $X$ $=$ TlCo(SCN)$_4$. In accounting for thesystematic variations of $R_{\rm c}$ among the three $\theta$-(BEDT-TTF)$_2X$,we found that stronger charge frustration leads to superior charge-glassformer. Our results suggest that charge frustration tends to slow the kineticsof charge ordering.

Systematic Variations in the Charge-Glass-Forming Ability of Geometrically Frustrated $\theta$-(BEDT-TTF)$_2X$ Organic Conductors